Đáp án:
bài 1: [( 46-32) mũ 2 -(54-42)mũ 2 ].36-1872
=[( 14 mũ 2 - 12 mũ 2)].36-1872
=[ 196-144].36-1872
=52.36-1872
= 1872-1872 = 0
bài 2: a, 2.x-138=2 mũ 3 . 2 mũ 3
2.x-138=2 mũ 6
2.x-138=64
2.x= 64+138
2.x=202
x=202:2=101
b,231-(x-6)=1339:13
231-(x-6)=103
x-6=231-103
x-6=128
x=128+6=134
d, ( 2600+6400) -3.x=1200
9000-3.x=1200
3.x=9000-1200
3.x=7800
x=7800:3=2600
m, [(x+32)-17].2=42
[(x+32)-17]=42:2
(x+32)-17=21
(x+32)= 21+17
x+32=38
x=38-32=6
f, [(6.x-72):2-84].28=5628
[(6.x-72):2-84]=5628:28
(6.x-72):2-84=201
(6.x-72):2=201+84
(6.x-72):2=285
6.x-72=285.2
6.x-72=570
6.x=570+72
6.x= 642
x=642:6=107
n, [61+(53-x)].17=1785
61+(53-x)=1785:17
61+(53-x)=105
53-x=105-61
53-x=44
x=53-44=9
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