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12.5x0.64x2.5简便计算脱式计算

12.5x0.64x2.5 =(12.5x0.8)x(0.4x2.5x2) =10x2 =20

12.5x9.6 =12.5x8x1.2 =100x1.2 =120 -----------------------------------------------------------------------------------------

4/5x4+2/5x2+1/5x16 =16/5+4/5+16/5 =36/5 =7.2

答案等于2400,有两种演算方法: 1、先依次计算,12.5乘24等于300,300乘8等于2400,之后按简算方法:12.5乘8等于100,100乘24等于2400。 2、用2400除以8等于300,300除以24等于12.5。

2.5x45x0.4 =2.5x0.4x45 =1x45 =45

简便方法计算如下: (12.5+102.5×7)×2.5×0.4 =[12.5+(90+12.5)x7]x2.5x0.4 =(12.5+90x7+12.5x7)x1 =12.5x(1+7)+90x7 =12.5x8+630 =100+630 =730

12.5x0.56x0.4x0.8x1250 =(12.5×0.8)×(0.4×1250)×0.56 =10×500×0.56 =5000×0.56 =280

1)2x+8=16 (2)x/5=10(3)x+7x=8 (4)9x-3x=6 (5)6x-8=4 (6)5x+x=9 (7)x-8=6x (8)4/5x=20 (9)2x-6=12 (10)7x+7=14 (11)6x-6=0 (12)5x+6=11 (13)2x-8=10 (14)1/2x-8=4 (15)x-5/6=7 (16)3x+7=28 (17)3x-7=26 (18)9x-x=16 (19)24x+x=50 (20)6/7x-8=4 (...

(455-12.5x4)÷9脱式计算 =(455-50)÷9 =405÷9 =45

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