B1
a,53.67+53.86+153.47
=53.(67+86)+153.47
=53.153+153.47
=153(53+47)
=153.100
=15300
b,12.88+38.246-38.158
=12.88+38.(246-158)
=12.88+38.88
=88.(12+38)
=88.50
=4400
c,2^4.16-2^4.13
=2^4(16-13)
=16.3
=48
d,150-{160-[170-(3+5)²+34]}
=150-{160-[170-8²+34]}
=150-{160-[170-64+34]}
=150-{160-[170-30]}
=150-{160-140}
=150-20=130
e,Bạn thông cảm mik chx ngĩ ra
B2
a,95-5(x-7)=40
5(x-7)=95-40
5x-35=55
5x = 55+35
5x = 90
x = 90:5
x = 18
b,2x-108=2².3³
2x-108=4.27
2x-108=108
2x =108+108
2x = 216
x = 216:2=108
c,(x+64)-157=41
x+64 =41+157
x+64 = 198
x = 198-64
x = 134
d,194+(158-x)=224
158-x=224-194
158-x=30
x=158-30
x=128
e,eror 404
B3
a,3.3636.3939=31+6+931+6+9 =316316
b,715715: 7878. 7272
= 715−8715−8. 7272
=7777. 7272
=77+277+2
= 7979
c,sory
d,4848.323323
=(2²)8(2²)8.(25)3(25)3
=22.822.8+25.325.3
=216216. 215215
=216+15216+15= 231231
e,511511. 5353: 512512
=511+3511+3: 512512
=514514: 512512
=514:12514:12
=5252
Bài dài quá mik chỉ làm đc vậy mong bạn thông cảm
CHÚC BẠN HỌC TỐT
