41.2乘8.1加11乘1.25加53.7乘1.9要简便怎么算
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41.2乘8.1加11乘1.25加53.7乘1.9
=41.2x8.1+11x1.25+(41.2+12.5)x1.9
=41.2x8.1+11x1.25+41.2x1.9+12.5x1.9
=41.2x(8.1+1.9)+11x1.25+1.25x19
=41.2x10+1.25x(11+19)
=412+1.25x30
=412+37.5
=449.5
=41.2x8.1+11x1.25+(41.2+12.5)x1.9
=41.2x8.1+11x1.25+41.2x1.9+12.5x1.9
=41.2x(8.1+1.9)+11x1.25+1.25x19
=41.2x10+1.25x(11+19)
=412+1.25x30
=412+37.5
=449.5
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