巧算42.15ⅹ1.25+28.5÷8+0.125ⅹ550?
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巧算要巧:
42.15x1.25+28.5÷8+0.125x550
=42.15x10×0.125+28.5×0.125+0.125x550
=(42.15×10+28.5+550)×0.125
=1000×0.125
=125
42.15x1.25+28.5÷8+0.125x550
=42.15x10×0.125+28.5×0.125+0.125x550
=(42.15×10+28.5+550)×0.125
=1000×0.125
=125
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