Đáp án:
Giải thích các bước giải:
a.135.25+45.75−25.95135.25+45.75-25.95
=25.135+25.3.45−25.95=25.135+25.3.45-25.95
=25.135+25.135−25.95=25.135+25.135-25.95
=25.(135+135−95)=25.(135+135-95)
=25.(270−95)=25.(270-95)
=25.175=25.175
=4375=4375
b
5.12+5.7+55.12+5.7+5
=5.12+5.7+5.1=5.12+5.7+5.1
=5(12+7+1)=5(12+7+1)
=5.20=5.20
=100=100
c.
100−(74−16)100-(74-16)
=100−74+16=100-74+16
=26+16=26+16
=42=42