4.78×5.12+478×0.318-47.8×2.6192的简便方法?
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4.78×5.12+478×0.318-47.8×2.6192
=4.78×5.12+4.78×31.8-4.78×26.192
=4.78×(5.12+31.8-26.192)
=4.78×63.112
=(4+0.8-0.02)×63.112
=252.448+50.48冇96-1.26224
=302.9376-1.26224
=301.67536
加了《冇》字将可能有问题的数字隔开
=4.78×5.12+4.78×31.8-4.78×26.192
=4.78×(5.12+31.8-26.192)
=4.78×63.112
=(4+0.8-0.02)×63.112
=252.448+50.48冇96-1.26224
=302.9376-1.26224
=301.67536
加了《冇》字将可能有问题的数字隔开
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