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第83页
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50
3.8
0.06
0.36
0.68
1.3
18.722
8.3
=(5.48+4.52)-(3.6+5.4)
=10-9
=1
=40.8-(3.48+16.52)
=40.8-20
=20.8
=0.8×12.5-0.8×1.25
=10-1
=9
=25.7×(99+1)
=25.7×100
=2570
=4.87×(0.25×4)
=4.87×1
=4.87
=(17.85-7.85)÷2.5
=10÷2.5
=4
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