3/8-0.375x3/7的简便算法.
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3/8-0.375x3/7
=3/8 - (0.5-0.125)x3/7
=3/8-(1/2 - 1/8)x3/7
=3/8-1/2x3/7+1/8x3/7
=3/8+1/8x3/7-1/2x3/7
=3/8(1+1/7)-1/2x3/7
=3/8x8/7 - 1/2x3/7
=3/7-1/2x3/7
=3/7x(1-1/2)
=3/7x1/2
=3/14
=3/8 - (0.5-0.125)x3/7
=3/8-(1/2 - 1/8)x3/7
=3/8-1/2x3/7+1/8x3/7
=3/8+1/8x3/7-1/2x3/7
=3/8(1+1/7)-1/2x3/7
=3/8x8/7 - 1/2x3/7
=3/7-1/2x3/7
=3/7x(1-1/2)
=3/7x1/2
=3/14
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