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1. ( -37 ) + 14 + 26 + 37
=(-37+37)+(14+26)
=0+30
=30
2. ( -24 )+ 6 + 10 + 24
=(-24+24)+(6+10)
=0+16
=16
3. 15 + 23 + ( -25 ) + ( -32 )
=[15+(-25)]+[23+(-32)]
=-10+(-9)
=-19
4. 60 + 33 + ( -50 ) + ( -33 )
=[60+(-50)]+[33+(-33)]
=10+0
=10
5. (- 16 ) + ( -209 ) + ( -14 ) + 209
=[-16+(-14)]+(-209+209)
=-30+0
=-30
6. (- 12 ) + ( -13 ) + 36 + ( -11 )
=[-12+(-11)]+(-13+36)
=-23+23
=0
7. - 16 + 24 - 16 - 34
=(24-34)-16-16
=-10-16-16
=-42
8. 25 + 37 - 48 - 25 - 37
=(25-25)+(37-37)-48
=0+0-48
=-48
9. 2575 + 37 - 48 - 25 - 37
=(2575-25)+(37-37)
=2550+0
=2550
10. 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17
=(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=20.4
=80
cái này giống BTVN của mk,nhưng dễ mak,tự làm đc mak
cố lên
\(2575+37-2576-29\)
\(=2612-2576-29\)
\(=36-29=7\)'
\(35+35+36+37-14-15-16-17\)
\(=70+\left(36-16\right)+\left(37-17\right)-14-15\)
\(=70+20+20-14-15\)
\(=90+6-15\)
\(=96-15=81\)
\(13\cdot\left(-12\right)+87.\left(-12\right)\)
\(=\left(-12\right)\cdot\left(13+87\right)\)
\(=\left(-12\right)\cdot100=-1200\)
\(26\cdot17+17\cdot74\)
\(=\left(26+74\right)\cdot17\)
\(=100\cdot17=1700\)
\(25\cdot\left(-18\right)+25\left(-82\right)\)
\(=25\cdot\left[\left(-18\right)+\left(-82\right)\right]\)
\(=25\cdot\left(-100\right)=\left(-2500\right)\)
\(25+37-48-25-37\)
\(=\left(25-25\right)+\left(37-37\right)-48\)
\(=0+0-48\)
\(=0-48=\left(-48\right)\)
\(\left(-16\right)+24+16-34\)
\(=\left[\left(-16\right)+16\right]+\left(24-34\right)\)
\(=0+\left(-10\right)=\left(-10\right)\)
a) \(\frac{3}{8}+\frac{7}{12}+\frac{10}{16}+\frac{10}{24}\)
= \(\frac{3}{8}+\frac{7}{12}+\frac{5}{8}+\frac{5}{12}\)
=\(\left(\frac{3}{8}+\frac{5}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
= \(\frac{8}{8}+\frac{12}{12}\)
= \(1+1\)
=\(2\)
b) \(\frac{4}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{14}{6}\)
= \(\frac{2}{3}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{3}\)
= \(\left(\frac{2}{3}+\frac{7}{3}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{17}{9}+\frac{1}{9}\right)\)
= \(\frac{9}{3}+\frac{26}{13}+\frac{18}{9}\)
= \(3+2+2\)
= \(7\)
Chúc bạn học tốt
Tính nhanh:
a, 3/8 + 7/12 + 10/16 + 10/24
= (3/8 + 10/16) + (7/12 + 10/24)
= (6/16 + 10/16) + (14/24 + 10/24)
= 16/16 + 24/24
= 1 + 1 = 2.
b, 4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
= (4/6 + 14/6) + (7/13 + 19/13) + (17/9 + 1/9)
= 18/6 + 26/13 + 18/9
= 3 + 2 + 2 = 7.
a) \(\frac{3}{8}+\frac{7}{12}+\frac{10}{16}+\frac{10}{24}\)
\(=\frac{3}{8}+\frac{7}{12}+\frac{5}{8}+\frac{5}{12}\)
\(=\left(\frac{3}{8}+\frac{5}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
\(=1+1\)
\(=2\)
b) \(\frac{4}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{14}{6}\)
\(=\frac{2}{3}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{3}\)
\(=\left(\frac{2}{3}+\frac{7}{3}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)\)
\(=\frac{9}{3}+\frac{26}{13}+\frac{18}{9}\)
\(=3+2+2\)
\(=7\)
a,\(15-\left(-4-x\right)=6\)
\(\Leftrightarrow-4-x=15-6\)
\(\Leftrightarrow-4-x=9\)
\(\Leftrightarrow x=-4-9\)
\(\Leftrightarrow x=-13\)
b,\(-30+\left(25-x\right)=-1\)
\(\Leftrightarrow25-x=-1-\left(-30\right)\)
\(\Leftrightarrow25-x=29\)
\(\Leftrightarrow x=25-29=-4\)
c,\(x-\left(12-25\right)=-8\)
\(\Leftrightarrow x+13=-8\)
\(\Leftrightarrow x=-21\)
e,\(x-5=1\Rightarrow x=6\)
g,\(x+30=-4\)
\(\Leftrightarrow x=-4-30\)
\(\Leftrightarrow x=-34\)
h,\(x-\left(-24\right)=3\)
\(\Leftrightarrow x+24=3\)
\(\Leftrightarrow x=3-24\)
\(\Leftrightarrow x=-21\)
i,\(\left(x+5\right)+\left(x-9\right)=x+2\)
\(\Leftrightarrow x+5+x-9-x-2=0\)
\(\Leftrightarrow x-6=0\)
\(\Leftrightarrow x=6\)
k,\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(\Leftrightarrow27-x+15+x-x+24=0\)
\(\Leftrightarrow-x+66=0\)
\(\Leftrightarrow-x=-66\)
\(\Leftrightarrow x=66\)
a) 15-(-4-x)=6
15 + 4 + x = 6
19 + x = 6
x = 6 - 19
x = 6 + ( -19 )
x = -13
b) -30+( 25- x ) =-1
25- x = -1 - ( - 30 )
25- x = -1 + 30
25- x =29
x = 25 - 29
x = 25 + ( -29 )
x = -4
c) x- ( 12-25) =-8
x - ( - 13 ) = -8
x + 13 = -8
x = -8 - 13
x = -8 + ( -13 )
x = - 21
d) ( x-29 ) - (17- 38 ) = -9
( x-29) - (-21 ) = -9
x -29 = -9 + ( -21 )
x -29 = -30
x = -30 + 29
x = -1
e) x-5=1
x = 1 + 5
x = 6
g) x + 30 = -4
x = -4 - 30
x = -4 + ( -30 )
x = -34
h) x- ( -24 ) = 3
x = 3 + ( -24 )
x = -21
l) 22- ( - x ) = 12
-x = 22 - 12
-x = 10
x = -10
i) ( x + 5 ) + ( x - 9 ) = x + 2
x + 5 + x - 9 = x + 2
x + x + ( 5 - 9 ) = x + 2
x + x + ( -4 ) = x + 2
x + x = x + 2 - ( -4 )
x + x = x + 2 + 4
x + x =x + 6
=> x = 6
1. a) 17.( 15 - 16 ) + 16.( 17 - 20 )
\(=17.15-17.16+16.17-16.20\)
\(=17.15-16.20\)
\(=17.3.5-16.5.4\)
\(=5\left(17.3-16.4\right)\)
\(=5.\left(51-64\right)\)
\(=5.\left(-7\right)=-35\)
Bài 2 :
a) 10.( x - 7 ) - 8.( x + 5 ) = 6.( -5 ) + 24
\(\Rightarrow\) 10x - 70 - 8x - 40 = -30 + 24
=> ( 10x - 8x ) = -6 + 70+40
\(\Rightarrow2x=104\)
\(\Rightarrow x=52\)
Vậy x = 52
Tớ làm theo đúng y/c của cậu r nhé
Ko bt bài 1 có đúng ko @@
!! Học tốt ~
#Chiyuki Fujito
1, ( -37 ) +14 + 26 + 37 = 40
2, 46 - 57 + 211 = 200
3, 16.40 - 8.20. 2 = 640 - 320 = 320
4, 24 ( 16 - 30 ) - 16 ( 24 - 30 ) = 384 - 720 - 384 + 480 = -240
5, ( -3 -5 ).( 4 + 6 ) = -8 . 10 = -80
6, 17 - 34 = -17
7, 22.( -12 ) + ( -12 ) . 78 = -264 -936 = -1200
8, 15 ( -40 ) - 20 ( -30 ) = -600 + 600 = 0
9, 17 ( 3 + 25 ) = 72 . 17 ( không hiểu câu này lắm )
10, 66.12 + 12.44 - 10.12 = 792 + 528 - 120 = 1200