3.1×0.75+0.75+0.25×5.6的简便运算
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3.1×0.75+0.75+0.25×5.6
=3.1x3x0.25+3x0.25+0.25x5.6
=9.3x0.25+3x0.25+0.25x5.6
=0.25x(9.3+3+5.6)
=0.25x17.9
=0.25x(10+8-0.1)
=0.25x10+8x0.25-0.1x0.25
=2.5+2-0.025
=4.5-0.025
=4.475。
=3.1x3x0.25+3x0.25+0.25x5.6
=9.3x0.25+3x0.25+0.25x5.6
=0.25x(9.3+3+5.6)
=0.25x17.9
=0.25x(10+8-0.1)
=0.25x10+8x0.25-0.1x0.25
=2.5+2-0.025
=4.5-0.025
=4.475。
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