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電子課本網(wǎng) › 第71頁

第71頁

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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

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