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12.8x(3.27一o.53)十4.2x13.7的简便方法

12.8x3.7+12.8x6.3 =12.8x(3.7+6.3) =12.8×10 =128 谢谢,请采纳

108×12-8×12 =(108-8)×12 =100×12 =1200

12.8x(12.8x5) =12.8*64 =(12.5+0.3)*64 =800+19.2 =819.2

12.8x3.7一6.5x3.7 =(12.8一6.5)x3.7 =6.3x3.7 =23.31

12x十8x=80 (12+8)x=80 20x=80 x=80÷20 x=4

8X12X125怎样用简使计算 8X12X125 =12*(8*125) =12*1000 =12000

8x(12十25) =8x12十8x25 =96+200 =296

8x十7(x十12)=1296 15x+84=1296 15x=1212 x=80.8

=8*125+8*12 =1000+96 =1096

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