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乘法分配律： ax(b+c)=ab+ac axb-axc=ax(b-c) 例： (2.5 － 0.25)×0.4

乘法分配律： ax(b+c)=ab+ac axb-axc=ax(b-c) 例： (2.5 － 0.25)×0.4 0.86×15.7 － 0.86×14.7 提高： 4.6×9.9 0.85×199 3.12 ＋ 3.12×99 28.6×10.1 － 2.86. 乘法结合律： axbxc=ax(bxc)=(axc)xb 例： 0.25×0.73×4 12.5x(0.45x0.8)

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乘法分配律： ax(b+c)=ab+ac axb-axc=ax(b-c) 例： (2.5 － 0.25)×0.4

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  1. 乘法分配律：ax(b+c)=ab+ac axb-axc=ax(b-c) 例： (2.5－0.25)×0.4 0.86×15.7－0.86×14.7 提高： 4.6×9.9 0.85×199 3.12＋3.12×99 28.6×10.1－2.86

  2. 乘法结合律：axbxc=ax(bxc)=(axc)xb 例：0.25×0.73×4 12.5x(0.45x0.8) 提高：12.5×0.32×0.25 区分：2.5x(0.8+0.4) 2.5x(0.8x0.4)

  3. 连除的性质：a÷b÷c=a÷c÷b=a÷(bxc) 例： 930÷0.25÷4 15÷(0.15×0.4) 其他：15÷0.25 125×0.8÷125×0.8 13.4×18÷1.34 62.5÷0.25×4

  4. 怎么简便怎么算： • 7.6×0.8+0.2×7.6         •  0.25×8.5×4   • 1.28×8.6+0.72×8.6    • 12.5×0.96×0.8    • 10.4－9.6×0.35 • 0.8×（4.3×1.25）    • 3.12＋3.12×99 •     28.6×101－28.6

  5. （4.23＋6.17）×0.8   • 0.86×15.7-0.86×14.7   • 2.4×102 • 14－7.32－2.68    • 2.64＋8.67＋7.36＋11.33   • 2.31×1.2×0.5 • （2.5－0.25）×0.4    • 9.16×1.50.5×9.16  •   3.6－3.6×0.5

  6. 乘法分配律：ax(b+c)=ab+ac axb-axc=ax(b-c) 例： (2.5－0.25)×0.4 0.86×15.7－0.86×14.7 提高： 4.6×9.9 0.85×199 3.12＋3.12×99 28.6×10.1－2.86 乘法结合律：axbxc=ax(bxc)=(axc)xb 例：0.25×0.73×4 12.5x(0.45x0.8) 提高：12.5×0.32×0.25 连除的性质：a÷b÷c=a÷c÷b=a÷(bxc) 例： 930÷0.25÷4 15÷(0.15×0.4)

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