Đáp án:
Câu 1:
a)37.143+57.37+1300
=37.(143+57)+1300
=37.200+1300
=7400+1300
=8700
b)15.2³+4.3²-5.7
=15.8+4.9-5.7
=120+36-35
=156-35
=121
c)30:{175:[355-(135+37.5)]}
=30:{175:[355-(135+185)]}
=30:{175:[355-320]}
=30:{175:35}
=30:5
=6
d)12+(-8)--1+(-5)
=12+-8--1+-5
=4--6
=10
Câu 2:
a)29x-13=74
29x =74+13
29.x =87
x =87:29
x =3
b)2017-5(x+1)=2012
5(x+1)=2017-2012
5.(x+1)=5
(x+1)=5:5
x+1=1
x =1-1
x =0
c)x∈Ư(24) và 8<x≤24
Ư(24)={1;2;3;4;6;8;12;24}
Vì 8<x≤24 nên x∈{12;24}
#Nocopy
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