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要简便运算! 125x16 = = =

125x16 =125x(2x8) =(125X8)x2 =1000x2 =2000

125x16x25=(125*4)*(4*25)=500*100=50000

125*8*2*50 =1000*100 =100000

(125×8)×(25×4)×3 =1000×100×3 =300000

原式 =125x16x39 =(125x8)x(2x39) =1000x78 =78000

原式 =125x(8x2) =(125x8)x2 =1000x2 =2000 供参考。

第一道题 (125X99+125)X16 =125X(99+1)X16 =25X5X4X4X100 =100X20X100 =200000 第二道题 5X999+5+99X7+7+3X9+3+9 =5X(999+1)+7X(99+1)+3X(9+1)+9 =5000+700+30+9 =5739

25×125×16 =(4×25)×(8×125)÷2 =100×1000÷2 =100000÷2 =50000.

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