0.65×6.4×0.65×5.4的简便算法
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0.65×6.4×0.65×5.4
=（0.65x0.65）x4x1.6x5.4
=(0.6x0.7+0.05x0.05)x4x1.6x5.4
=0.4225x4x1.6x5.4
=1.69x2x5.4-1.69x0.4x5.4
=1.69x10.8-1.69x2.16
=1.69x10+1.69x0.8-1.69x2.16
=16.9-1.69x(2.16-0.8)
=16.9-1.69x1.36
=16.9-2x1.36+0.3x1.36+0.01x1.36
=16.9-2.72+0.408+0.0136
=14.18+0.4216
=14.6016
=（0.65x0.65）x4x1.6x5.4
=(0.6x0.7+0.05x0.05)x4x1.6x5.4
=0.4225x4x1.6x5.4
=1.69x2x5.4-1.69x0.4x5.4
=1.69x10.8-1.69x2.16
=1.69x10+1.69x0.8-1.69x2.16
=16.9-1.69x(2.16-0.8)
=16.9-1.69x1.36
=16.9-2x1.36+0.3x1.36+0.01x1.36
=16.9-2.72+0.408+0.0136
=14.18+0.4216
=14.6016
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