bài 1
1,7.2^3 -16 :2^2
2,27.87 +87 .74 -87
3,17.85 +15 .17 -120
4,80-[4.5^2-3.2^3
5,5.4^2-18:3^2
6,27.55+45.27-682
bài 2
1,[x+74]-56=118
2,23-3x=15
3,[3x-2^4].7^5 =2.7^6
4,231-[x-6]=1339:13
5,3737:[12x-91]=37
6,[2x-8].2=25
giúp mk nha ^.^
hôm nay mk xả điểm luôn