第71页

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=37-37×0.728-37×0.172
=37×(1-0.728-0.172)
=37×0.1
=3.7
=28×2.34+28×6.54+11.1×57.6
=28×8.88+11.1×57.6
=224×1.11+576×1.11
=(224+576)×1.11
=888
=(1+1.2)+(1+1.2)×2+(1+1.2)×3+...+(1+1.2)×99+
(1+1.2)×100
=2.2×(1+2+3+...+99+100)
=2.2×101×50
=11110
56
20
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