Đáp án:a)2(x-51)=2*2^3+20
2(x-51)=2*8+20
2(x-51)=16+20
2(x-51)=36
x-51=36:2
x-51=18
x=18+51
x=96
b)450:(x-19)=50
x-19=450:50
x-19=9
x=19+9
x=28
c)4(x-3)=7^2-1^10
4(x-3)=49-1
4(x-3)=48
x-3=48:4
x-3=24
x=24+3
x=27
d)135-5(x+4)=35
5(x+4)=100
x+4=50
x=46
e)25+3(x-8)=106
3(x-8)=81
x-8=27
x=35
f)3^2(x+4)-5^2=5*2^2
9(x+4)-25=20
9(x+4)=45
x+4=5
x=1
g)3(2x+1)-19=14
3(2x+1)=33
2x+1=11
2x=10
x=5
i)(x-27):12=204
x-27=2448
x=2475
h)3636:(12x-91)=36
12x-91=101
12x=192
x=192:12
x=16
j)7^2-(13+4x)=5*2^3
49-(13+4x)=5*8
49-(13+4x)=40
13+4x=9
4x=9-13
4x=-4
x=-1
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