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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

= $4.98-(\frac2{15}+\frac{13}{15})$

= $4.98-1$

=3.98

= $\frac7{12}×\frac98×\frac34$

= $\frac{63}{128}$

=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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