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a) 320 x 63 - 16 x 20 + 32 x 370
= 320 x 63 - 320 x + 320 x 37
= 320 x ( 63 - 1 + 37 )
= 320 x 99
= 320 x ( 100 - 1 )
= 320 x 100 - 320
= 32000 - 320 = 31 680
b) 35 x 61 + 215 x 5 + 35 x 39 + 57 x 25
= 5 x 427 + 5 x 215 + 5 x 273 + 5 x 285
= 5 x ( 427 + 215 + 273 + 285 )
= 5 x 1200 = 6000
c) 34 x 24 - 94 x 6 + 83 x 48 - 47 x 88
= 204 x 4 - 4 x 141 + 996 x 4 - 1034 x 4
= 4 x ( 204 - 141 + 996 - 1034 )
= 4 x 25 = 100
a. - (- 94) + (67 - x) : 2 = (- 34 - 14)
b. 73 - (- 20 + 37) = x - (57 - 39)
c. - (- 34 - 23) = x + 37
\(a,-\left(-94\right)+\left(67-x\right):2=\left(-34-14\right)\)
\(94+67-x:2=-48\)
\(161-x:2=-48\)
\(x:2=209\)
\(x=\frac{209}{2}\)
a) 1245 - 3x = 735
3x = 1245 - 735
3x = 510
x = 510 : 3
x = 170
b) 14x - 8x + 34 = 94
6x + 34 = 94
6x = 94 - 34
6x = 60
x = 60 : 6
x = 10
c) 3x+2 + 3x = 270
3x . 32 + 3x . 1 = 270
3x . ( 32 + 1 ) = 270
3x . 10 = 270
3x = 270 : 10
3x = 27
3x = 33
=> x = 3
a) 1245 - 3x = 735
3x = 1245 - 735
3x = 510
x = 510 : 3
x = 170
b,14x - 8x + 34 = 94
14x - 8x =94-34
14x - 8x =60
x(14-8) = 60
x.6 =60
x =60 :6
x =10
Bài 2:a, x+17=109
x =109-17
x =92
b,x+34=56+42+43
x+34=141
x =141-34
x =107
c,2x+45=x+94
2*x =x+94-45
x+x =x+49
suy ra x=49
d,x+109=1+2+3+........+99
x+109=495
x =495-109
x =386
Bài 1 mik ko có làm được.
1: =66+34-73-27+99=99
2: =54-45+30-54-30+5=-40
3: =42-56+33-33+56-42=0
4: =50-47-50+18+47-18=0
5: =10-28+30-4=2-4+10=12-4=8
\(\text{1.-(-66)+34+(-73)-27+99}.\)
\(=66+34-73-27+99=100-100+99=-99.\)
\(\text{2.54-(45-30+54)-30+5}.\)
\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)
\(\text{3.42-56+33-(33-56+42)}.\)
\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)
\(\text{4.50-(47+50-18)+(47-18)}.\)
\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)
\(\text{5.10-(28-30+4)}.\)
\(=10-28+30-4=10+30-20-8-4=20-12=8.\)
\(\text{6.-(-73)+(44-94+27)+94}.\)
\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)
63-(34+94)-X=-128
-65-X=-128
X=-65--128
X=63
63 - x - 34 - 94 = -34 -94
63 - x - 128 = -128
63 - x = 0
x = 63