3.8×0.22+0.38×7.7用简便计算怎么算?
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3.8×0.22+0.38×7.7=3.8×0.22+3.8×0.77=3.8×(0.22+0.77)=3.8×0.99=3.8×(1-0.01)=3.8×1-3.8×0.01=3.8-0.038=3.762
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3.8×0.22+0.38×7.7
=3.8×0.22+0.38×10×0.77
=3.8×0.22+3.8×0.77
=3.8×(0.22+0.77)
=3.8×(1-0.01)
=3.8×1-3.8×0.01
=3.8-0.038
=3.762
=3.8×0.22+0.38×10×0.77
=3.8×0.22+3.8×0.77
=3.8×(0.22+0.77)
=3.8×(1-0.01)
=3.8×1-3.8×0.01
=3.8-0.038
=3.762
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解:3.8×0.22+0.38×7.7
=0.38×2.2+0.38×7.7
=0.38×9.9
=0.38×(10-0.1)
=3.8-0.038
=3.762
=0.38×2.2+0.38×7.7
=0.38×9.9
=0.38×(10-0.1)
=3.8-0.038
=3.762
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3.8X0.22+0.38X7.7
=3.8X0.22+3.8X0.77
=3.8X(0.22+0.77)
=3.8X0.99
=3.8X(1-0.01)
=3.8-0.038
=3.762
=3.8X0.22+3.8X0.77
=3.8X(0.22+0.77)
=3.8X0.99
=3.8X(1-0.01)
=3.8-0.038
=3.762
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用乘法分配律来计算。
3.8x0.22+0.38x7.7
=0.38x2.2+0.38x7.7
=0.38x(2.2+7.7)
=0.38x9.9
=0.38x(10-0.1)
=0.38x10-0.38x0.1
=3.8+0.038
=3.838
3.8x0.22+0.38x7.7
=0.38x2.2+0.38x7.7
=0.38x(2.2+7.7)
=0.38x9.9
=0.38x(10-0.1)
=0.38x10-0.38x0.1
=3.8+0.038
=3.838
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