( x - 25 ) nhan 17 = 34
145 + ( 150 - x ) = 250
( 2 nhân x - 7 ) nhan 81 = 0
x - 90 : 15 = 32
520 - ( x - 5 ) = 250 : 5
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\(25\frac{2}{13}-\left(\frac{15}{17}+15\frac{2}{3}\right)=\frac{327}{13}-\left(\frac{15}{17}+\frac{47}{3}\right)\)
\(=\frac{327}{13}-\frac{844}{51}\)
\(=\frac{5705}{663}\)
\(\frac{5}{30}+\frac{15}{90}+\frac{250}{150}+\frac{350}{210}+\frac{45}{270}=\frac{1}{6}+\frac{1}{6}+\frac{5}{3}+\frac{5}{3}+\frac{1}{6}\)
\(=\frac{3}{6}+\frac{10}{3}\)
\(=\frac{1}{2}+\frac{10}{3}\)
\(=\frac{23}{6}\)
\(3\frac{1}{11}.\frac{27}{46}.1\frac{6}{17}.2\frac{4}{9}=\frac{34}{11}.\frac{27}{46}.\frac{23}{17}.\frac{22}{9}\)
\(=\frac{68}{9}.\frac{27}{34}\)
\(=6\)
1. . 7,2 : 2,4 x X = 4,5
3 x X = 4,5
X = 4,5 : 3
X = 1,5
2. X x 4,8 + 5,2 x X = 160
=> X x ( 5,2 + 4,8 ) = 160
X x 10 = 160
X = 160 : 10
X = 16
3. 9,15 x X + 2,85 x X =48
=> ( 9,15 + 2,85 ) x X = 48
12 x X = 48
X = 48 : 12
X = 4
4. ( X x 3 + 4 ) : 5 = 8
X x 3 + 4 = 8x 5
X x 3 + 4 = 40
X x 3 = 40 - 4
X x 3 = 36
X = 36 : 3
X = 12
5. ( 15 x 28 - x ) : 2/5 = 200 : 0,4
15 x 28 - x = 200 : 0,4 x 2/5
15 x 28 - x = 200
15 x 28 = 200 + x
420 = 200 + x
x = 420 - 200
x = 220
6. 7 x ( 8 + 2 x X ) = 210
8 + 2 x X = 210 : 7
8 + 2x = 30
=> 2x = 30 - 8
2x = 22
x= 22 : 2
x = 11
7. X x 5,6 + 4,4 x X = 130
X x ( 5,6 + 4,4 ) = 130
X x 10 = 130
X = 130 : 10
X = 13
8. ( x - 12 ) x 17 : 11 = 51
x - 12 = 51 x 11 : 17
x - 12 = 33
x = 33 + 12
x = 45
9. 9,15 x X + 2,85 x X = 48
X x ( 9,15 + 2,85 ) = 48
X x 10 = 48
X = 48 : 10
X = 4,8
a) (x.7 +8):5=10
x.7 +8= 10.5=50
x.7= 50-8=42
x= 42:7=6
b) 280: (7+3.x)=4
7+3.x= 4.280= 1120
3.x= 1120-7 =1113
x= 1113: 3= 371
c) (x.5) .19:13= 57
(x.5). 19= 57.13= 741
x.5= 741: 19= 39
x= 39:5 =7,8
d) 6.(28-8).x = 72
20.x= 72:6= 12
x= 12: 20= 0,6
e) 4. (36-4.x)= 3,2
36-4.x= 32:4= 0,8
-4.x= 0,8- 36= -35,2
x= -35,2 : -4 = 8,8
f) (x-15).3 :12= 6
(x-15).3 = 6. 12= 72
x-15= 72: 3= 24
x= 24+ 15= 39
g) (x:4+ 6) . 7 = 70
x:4+6= 70:7= 10
x:4= 10-6= 4
x= 4.4 = 16
h) (x:2+50) :5= 12
x:2+ 50= 12.5= 60
x:2= 60-50= 10
x= 10.2=20
l) 5.(7+3.x)= 140
7+3.x= 140:5 = 28
3.x= 28-7 =21
x= 21: 3= 7
k cho mình nhe
\(a,96-3\left(x+8\right)=42\\ \Rightarrow3\left(x+8\right)=54\\ \Rightarrow x+8=18\\ \Rightarrow x=10.\\ b,15.5\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)=225\\ \Rightarrow x-25=3\\ \Rightarrow x=28.\\ c,250:x+15=25\\ \Rightarrow250:x=10\\ \Rightarrow x=25\\ d,36:\left(x-5\right)=2^2\\ \Rightarrow36:\left(x-5\right)=4\\ \Rightarrow x-5=9\\ \Rightarrow x=14.\\ e,\left[3.\left(70-x\right)+5\right]:2=46\\ \Rightarrow3.\left(70-x\right)+5=92\\ \Rightarrow3\left(70-x\right)=87\\ \Rightarrow70-x=29\\ \Rightarrow x=41.\)
vì bài dài nên mk chỉ ghi kết quả thui nha
a,0
b,19
c,-54
d,17
e,-100
f,65
t,17
y,65
o,63
p,0
3,
a,-10
b,-100
1 Tính :
a)5+(-5)=0
b)71-25=46
c)28+(-82)=-54
d)47+(-30)=17
e)(-41)+(-59)=-100
f)75+(-10)=65
t)26-43=-17
y)90-25=65
o)72+(-9)=63
p)(-3)+3=0
2 Tính nhanh :
a)(-150)-47+150-53
=(-150+150)-47-53
=-100
b)250+(-90)-250-10+100
=(250-250)+(-90)-10+100
=0
c)71+92-28-(-29)+8-72
=71+92-28+29+8-72
=(71+29)+(92+8)-(28+72)
=100+100-100
=100
d)45+(-31)-45+(-31)
=(45-45)+(-31+-31)
=-62
3 Tìm x biết :
a)x-5=-15
x=-15+5
x=-10
b)21+x=-79
x=-79-21
x=-100
c)x-15=-23+(-6)
x-15=-29
x=-29+15
x=-14
d)200-x=/-32/-41
200-x=32-41
200-x=-9
-x=-9-200
-x=-209
=>x=209
\(\left[12\cdot15-x\right]\cdot\frac{1}{4}=120\cdot\frac{1}{4}\)
\(\Leftrightarrow\left[180-x\right]\cdot\frac{1}{4}=30\)
\(\Leftrightarrow180-x=30:\frac{1}{4}\)
\(\Leftrightarrow180-x=120\)
\(\Leftrightarrow x=60\)
bài 1:tính nhanh nếu có thể
250:{855:[540-(81+62x23)]}
= 250:{855:[540-( 81 + 36 x 8)]}
= 250:{855:[540-( 81 + 288 )]}
= 250:{855:[540 - 369 ]}
= 250:{855 : 171}
= 250:5
= 50
bài 2:tìm số tự nhiên x
a.(x-17).200=400
( x - 17 ) = 400 : 200
x - 17 = 2
x = 2 + 17
x = 19
b.(x-105):21=15
( x - 105 ) = 15 x 21
( x - 105 ) = 315
c.541+(218-x)=735
(218-x) = 735 - 541
218-x = 194
x = 218 - 194
x = 24
d.24+5x=75:73
24 + 5x = 72
24 + 5x = 49
5x = 49 - 24
5x = 25
=> x = 25 : 5
x = 5
( x - 25) x 17 = 34
=> x - 25 = 34 : 17
x - 25 = 2
=> x = 2 + 25
x = 27
145 + (150 - x) = 250
=> 150 - x = 250 - 145
150 - x = 105
=> x = 150 - 105
x = 45
(2x - 7) x 81 = 0
=> 2x - 7 = 0 : 81
2x - 7 = 0
=> 2x = 7
=> x = 7 : 2 = 3,5
x - 90 : 15 = 32
=> x - 6 = 32
=> x = 32 + 6
x = 38
520 - (x - 5) = 250 : 5
=> 520 - (x - 5) = 50
=> x - 5 = 520 - 50
x - 5 = 470
=> x = 470 + 5
x = 475
t i c k nhé!! 346457567684786896789
a ) \(\left(x-5\right).17=34\)
=> \(x-5=2\)
=> \(x=7\)
b ) \(145+\left(150-x\right)=250\)
=> \(150-x=105\)
=> \(x=150-105\)
=> \(x=45\)
c ) \(\left(2.x-7\right).81=0\)
=> \(2x-7=0\)
=> \(2x=7\)
=> \(x=\frac{7}{2}\)
d ) \(x-90:15=32\)
=> \(x-6=32\)
=> \(x=38\)
Mấy cái dấu chấm đó là nhân đó nhé