0.4x2.3x3.8的简便运算
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0.4x2.3x3.8
=[0.4x(2+0.3)]x(3+0.8)
=(0.4x2+0.4x0.3)x(3+0.8)
=(0.8+0.12)x(3+0.8)
=0.92x(3+0.8)
=0.92x3+0.92x0.8
=2.76+0.736
=3.496
=[0.4x(2+0.3)]x(3+0.8)
=(0.4x2+0.4x0.3)x(3+0.8)
=(0.8+0.12)x(3+0.8)
=0.92x(3+0.8)
=0.92x3+0.92x0.8
=2.76+0.736
=3.496
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