第72页

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a+b=b+a
a+b+c=a+(b+c)
a×b=b×a
a×b×c=a×(b×c)
a×(b+c)=a×b+a×c
5.6
(9-7+1)×8=24
22÷4-0.2×7=4.1
(675-75×5)÷2.5=120
=48÷0.12
=400
​$= 4.98-(\frac 2{15}+\frac {13}{15})$​
​$= 4.98-1$​
​$=3.98$​
​$= \frac 7{12}×\frac 98×\frac 34$​
​$= \frac {63}{128}$​
=2.5×4×(8×12.5)
=10×100
=1000
=4.02×(9.8+0.2)
=4.02×10
=40.2
=(5.8-5.8)÷3.7
=0
=7.2÷(4.25+0.25)
=7.2÷4.5
=1.6
=(1.4-2.4+2.25)×0.5
=1.25×0.5
=0.625
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