Đáp án:

Bài 1:

a, `2^3+5^4:5^2+15.3^2`

`=8+5^2+15.9`

`=5+25+135`

`=165`

b, `5.2^2 .2^4+3(32:8)`

`=5.2^6+3(2^5:2^3)`

`=5.2^6+3.2^2`

`=332`

c, `(3^2 .20+3^2 .7):3^5=3^2(20+7):3^5=3^(-3).3^3=3^0=1`

d, `3^6:3^2+2^3 .2^2-3^3 .3`

`=3^4+2^5-3^2`

`=81+32-9`

`=104`

`e,5[(92+8):25+2^4]-6^2``=5.(100:25+16)-36`

`=5(4+16)-36``=5.20-36`

`=100-36`

`=64`

`f,4[(3+3^3):10+97]+7^2`

`=4(30:10+97)+49`

`=4(3+97)+49`

`=4.100+49`

`=400+49`

`=449`

Bài 2:

a, `x-25=150`

`x=150+25`

`x=175`

Vậy `x=175`

b, `3^3+x-9=125`

`27+x-9=125`

`x=125-27-9`

`x=111`

Vậy `x=111`

c, `5.2^2+x+3=5^2`

`5.4+x+3=25`

`20+x+3=25`

`x=25-20-3`

`x=2`

Vậy `x=2`

d, `5+x+3^3=2^6`

`5+x+27=64`

`x=64-5-27`

`x=32`