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求20.5*0.12的最简便算法

20-12.5*0.12 =20-1.5 =18.5 没有简算,直接计算

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求“0.8 x 0.25 x 0.4 x 12.5 =”的简便运算 运算思路:先按照相乘化整数的方法,0.8乘以12.5等于10,0.4乘以0.25等于0.1,再计算10乘以0.1等于1。 0.8 X 0.25 X 0.4 X 12.5 = ( 0.8 X 12.5 ) X ( 0.25 X 0.4) = 10 X 0.1 = 1

12.5*21+12.5*3.8+0.125*4100 =12.5×(21+3.8+41) =12.5×65.8 =12.5×64+12.5×1.8 =12.5×8×8+12.5×2×0.9 =100×8+25×0.9 =800+22.5 =822.5

12.5×0.32÷0.4 =12.5×0.8×0.4÷0.4 =10×(0.4÷0.4) =10×1 =10

12.5×4.5+4.5×12.5+12.5 =12.5×(4.5+4.5+1) =12.54×10 =125

3又3/5*25又2/5+37.9*6又2/5 =3.6*25.4+25.4*6.4+12.5*6.4 =(3.6+6.4)*25.4+12.5*8*0.8 =10*25.4+100*0.8 =254+80 =334

0.8×0.25×0.4×12.5=0.25×0.4×0.8×12.5=0.1×10=1

20分之1比0.12=5/12 4分之三小时比45分钟 =1 256比1.6=160 4.6比5分之19 =23/19

64×12点5×0点二五×0点零五 =12.5x8x0.25x4x0.05x2 =100x1x0.1 =10 朋友,请及时采纳正确答案,下次还可能帮到您哦,您采纳正确答案,您也可以得到财富值,谢谢。

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