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125×14×4×8×25×5×20的简便远算

如图

(125*8)*(25*4)*(20*5)*14

(125×25)×4 =125×(25×4) =125×100 =12500

=(8✘125)✘(25✘4)

175x56 =(25x7)x(4x14) =(25x4)x(7x14) =100x98 =9800 25x50x25x20x40 =(25x40)x(50x20)x25 =1000x1000x25 =1000000x25 =25000000 供参考。

第一个等于(55+44+1)*20等于100*20等于2000 第二个等于258-2.58等于255.42

36×15 =6x(6x15) =6x90 =540

4.25(4.25+4.21+8.42) =4.25x(8.46+8.42) =4.25x16.88 =4x16.88+0.25x16.88 =67.52+16.88/4 =67.52+4.22 =71.74

=125×8×11 =1000×11 =11000

9×37+9×63 =9x(37+63) =9x100 =900

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