379乘0.38加159乘6.21加3.79乘121

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379乘0.38加159乘6.21加3.79乘121
379乘0.38加159乘6.21加3.79乘121

379乘0.38加159乘6.21加3.79乘121
379×0.38+159×6.21+3.79×121
=3.79×(38+121)+159×6.21
=3.79×159+159×6.21
=159×(3.79+6.21)
=159×10
=1590

379*0.38+159*6.21+3.79*121=379*0.38+379*1.21+159*6.21=379*(0.38+1.21)+159*6.21
=379*1.59+1.59*621=1.59*(379+621)=1590

379*0.38+159*6.21+3.97*121=1590