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25x5x64x125的简便运算

原式 =25x5x(4x2x8)x125 =(25x4)x(5x2)x(8x125) =100x10x1000 =1000x1000 =1000000 供参考。

采纳详解

125x64x25 =(125×8)×(8×25) =1000×200 =200000

64x25x125x5 =(4x25)x(8×125)x(2×5) =100×1000×10 =1000000

125x25x64x5 =125x25x8x4x2x5 =(125x8)x(25x4)x(2x5) =1000x100x10 =1000000

解题关键:64=2x4x8 937x125x25x64x5 =937x125x25x(2x4x8)x5 =937x(125x8)x(25x4)x(5x2) =937x1000x100x10 =937000000

25x32x125=25x4x8x125=25x4x25x4x2x5=100x100x10=100000 125x5x64x5=25x5x5x5x64=5x2x5x2x5x2x5x2x5x2x2=200000 13x99十13=13x100=1300 36x111十888x8=36x111+111x64=111x(36+64)=111x100=11100

运算定律与简便计算 (一)加减法运算定律 1.加法交换律 定义:两个加数交换位置,和不变 例如:16+23=23+16 546+78=78+546 2.加法结合律 定义:先把前两个数相加,或者先把后两个数相加,和不变。 注意:加法结合律有着广泛的应用,如果其中有...

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