A=67/43+106/79+52/79+19/43=?
nếu biết mình cảm ơn
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\(\frac{67}{43}+\frac{106}{79}+\frac{52}{79}+\frac{19}{43}\)
\(=\left(\frac{67}{43}+\frac{19}{43}\right)+\left(\frac{106}{79}+\frac{52}{79}\right)\)
\(=2+2\)
\(=4\)
\(Ta\) \(có\)
\(\frac{67}{43}+\frac{106}{79}+\frac{52}{79}+\frac{19}{43}\)
\(=\left(\frac{67}{43}+\frac{19}{43}\right)+\left(\frac{106}{79}+\frac{52}{79}\right)\)
\(=\frac{86}{43}+\frac{158}{79}\)
\(=\frac{6794}{3397}+\frac{6794}{3397}\)
\(=\frac{13588}{10094}=\frac{6794}{5047}\)
a) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5\)
\(\Rightarrow x=10\)
b) \(15-\left(3+2x\right)=2^2\)
\(\Rightarrow3+2x=15-4\)
\(\Rightarrow3+2x=11\)
\(\Rightarrow2x=11-3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=\dfrac{8}{2}\)
\(\Rightarrow x=4\)
c) \(-11-\left(19-x\right)=50\)
\(\Rightarrow19-x=-11-50\)
\(\Rightarrow19-x=-61\)
\(\Rightarrow x=61+19\)
\(\Rightarrow x=80\)
d) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
e) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=52-17\)
\(\Rightarrow79-x-43=35\)
\(\Rightarrow36-x=35\)
\(\Rightarrow x=1\)
f) \(\left(7+x\right)-\left(21-13\right)=32\)
\(\Rightarrow7+x-8=32\)
\(\Rightarrow x-1=32\)
\(\Rightarrow x=32+1\)
\(\Rightarrow x=33\)
g) \(-x+20=-15+8+13\)
\(\Rightarrow-x+20=6\)
\(\Rightarrow x=20-6\)
\(\Rightarrow x=14\)
h) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow x-13+142+18=55\)
\(\Rightarrow x+147=55\)
\(\Rightarrow x=55-147\)
\(\Rightarrow x=-92\)
a, 159 - ( 25 - x) = 43
159 - 25 + x = 43
134 + x = 43
x = 43 - 134
x = - 91
b, ( 79 -x) - 43 = -( 17 -52)
79 - x - 43 = -( -35)
36-x = 35
x = 36- 35
x = 1
159 − (25 − x) = 43
159 − 25 + x = 43
x = 43 − 159 + 25
x = −91.
(79 − x) − 43 = −(17 − 52)
79 − x − 43 = −17 + 52
−x = −17 + 52 − 79 + 43
−x = −1
x = 1.
-7264 + ( 1543 + 7264 )
=-7264 + 1543 + 7264
=1543
(144 - 97 ) -144
=144 - 97 - 144
=-97
( -145 ) - ( 18 -145 )
= -145 - 18 - 145
=-308
111 + ( -11 + 27 )
=111 - 11 + 27
=127
( 27+ 514 ) - (486-73)
=27 + 514 - 486 - 73
=-18
( 36 + 79 ) + ( 145 - 79 - 36 )
=36 + 79 + 145 - 79 - 36
=145
( 38 -29+ 43 ) - ( 43 + 38 )
=38 - 29 + 43 - 43 + 38
=47
271 - [ ( -43 ) + 271 - ( -17)]
= 271 + 43 + 271 + 17
=602
-144 - [ 29 - ( + 144 ) - ( + 144 ) ]
=-144 - 29 - 144 - 144
=-461
hok tốt !
a) -7264+(1543 +7264) b) (144-97)-144 c)(-145)-(18-145)
=(-7264)+1543+7264 =144-97-144 =(-145)-18+145
= [(-7264)+7264]+1543 =(144-144)-97 =[(-145)+145}-18
=0+1543 =0-97 = 0-18
=1543 = -97 = -18
BỎ DẤU NGOẶC RỒI TÍNH :
1. - 7264 + ( 1543 + 7264 )
= ( - 7264 ) + 1543 + 7264
= [ ( - 7264 ) + 7264 ] + 1543
= 0 + 1543
= 1543
2. (144 - 97 ) - 144
= 144 + ( - 97 ) + (- 144 )
= [ 144 +( - 144) ] + ( -97 )
= 0 + (- 97)
= - 97
3. ( - 145 ) - ( 18 - 145 )
= ( -145 ) + ( - 18 ) + 145
= [ ( -145 ) + 145 ] + ( -18 )
= 0 + ( - 18)
= - 18
4. 111 + ( - 11 + 27 )
= 111 + ( - 11 ) + 27
= ( 111 + 27 ) + ( -11 )
= 138 + ( -11 )
= 127
5. ( 27 + 541 ) - ( 486 - 73 )
= 27 + 541 + ( - 486) + 73
= ( 27 + 73 ) + [ 541 + ( - 486 )]
= 100 + 55
= 155
6. ( 36 + 79 ) + ( 145 - 79 - 36)
= 36 + 79 + 145 + ( - 79 ) + ( - 36 )
= [ 36 + ( - 36)] + [ 79 + ( -79 )] + 145
= 0 + 0 + 145
= 145
7. 10 - [ 12 - ( -9 - 1) ]
= 10 + ( - 12 ) + 9 + ( -1 )
= ( 10 + 9 ) + [ ( -12 ) + ( - 1) ]
= 19 + ( - 13 )
= 6
8. ( 38 - 29 + 43 ) - (43 + 38 )
= 38 + ( - 29 ) 43 + ( -43 ) +( - 38)
= [ 38 + ( - 38 )] + [ 43 + ( - 43 ) ] + ( - 29 )
= 0 + 0 + ( - 29 )
= - 29
9. 274 - [ ( - 43 ) + 271 - ( - 17 )]
= 274 + 43 + ( - 271 ) + 17
= [ 274 + ( - 271 ) ] + ( 43 + 17 )
= 3 + 60
= 63
10. - 144 - [ 29 - ( + 144 ) - ( + 144 )
= ( - 144 ) + ( - 29 ) + 144 +( - 144 )
= [ ( - 144 ) + 144 ] + [ ( -29) + ( - 144 ) ]
= 0 + ( - 173 )
= - 173
k cho mk nếu đúng . Sai thì thôi nhé . ahihi
=
\(1.-7264+\left(1543+7264\right)\)
\(=-7264+1543+7264\)
\(=1543\)
\(2.\left(144-97\right)-144\)
\(=144-97-144\)
\(=-97\)
\(3.\left(-145\right)-\left(18-145\right)\)
\(=-145-18+145\)
\(=-18\)
\(4.111+\left(-11\right)+27\)
\(=111-11+27\)
\(=100+27\)
\(=127\)
\(5.\left(27+541\right)-\left(486-73\right)\)
\(=27+541-486+73\)
\(=\left(27+73\right)+\left(541-486\right)\)
\(=100+55\)
\(=155\)
các câu còn lại tương tự phá ngoặc ra nha
e, (-25).(-13).8.(-4).125
= (-25).(-4).8.125.(-13)
= 100.1000.(-13)=-1300000
f, 38.(-43)+43.(-79)-(-43).17
= 38.(-43)+(-43).79-(-43).17
= (-43).(38+79-17)
= (-43).100=-4300
a) ( -7) . 11 + 7 . ( - 89 )
= 7 . (-11) + 7 . (-89)
= 7 . [(-11)+(-89)]
= 7 . (-100)
= -700
mk ko ghi lại đề bài nha
A = ( 67/43 + 19/43 ) + (106/79 + 52/79)
A = 86/43 + 158/79
A = 2 + 2
A = 4
k mk nha bn
A = 67/43 + 106/79 + 52/79 + 19/43
A = ( 67/43 + 19/43 ) + ( 106/79 + 52/79 )
A = 2 + 2
A = 4 .
100 % LÀ ĐÚNG . CÂU NÀY THẦY GIÁO GIẠY MK NÈ.
NHỚ K CHO MIK NHÉ .