50 ×12.5+ 1.25 ×321 -125 ×0.21怎样算简便
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50×12.5+1.25×321-125×0.21怎样算简便50×12.5+1.25×321-125×0.21怎样算简便50×12.5+1.25×321-125×0.21怎样算简便50x12.5+1.
50 ×12.5+ 1.25 ×321 -125 ×0.21怎样算简便
50 ×12.5+ 1.25 ×321 -125 ×0.21怎样算简便
50 ×12.5+ 1.25 ×321 -125 ×0.21怎样算简便
50x12.5+1.25x321-125x0.21 =500x1.25+321x1.25-1.25x21 =1.25x(500+321-21) =1.25x800 =1000
50 ×12.5+ 1.25 ×321 -125 ×0.21怎样算简便
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265x(-1.25)-12.5x13.5+0.125x3980的简便法答的好给50
用因式分解方法做简便计算一 .12.5^2-12.5×5+6.25 二.21.5^2-3×21.5+1.5^2-100 三.125×0.45-12.5×6.7+1.25×122
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