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125x125 64巧算

64x125x125=8x8x125x125=(8x125)x(8x125)=1000x1000=1000000

125*64*25*5=125*8*4*2*25*5=(125*8)*(4*25)*(2*5)=1000*100*10=1000000

125x(8x8) =125x8x8 =1000x8 =8000

(48x5)x125=6x8x5x125=6x5x(8x125)=30x1000=30 000是乘法结合律和乘法交换律

64*125=8*8*125=1000*8=8000

原式=125*99*64+125*64=125*8*8*99+125*8*8=8000*99+8000=8000*(99+1)=8000*100=800000

解:根据拆分法和结合律的运用,原式=2016x125=252x8x125=252x1000=252000

(125乘以8)乘以(25乘以4)乘以21000乘以100乘以2100000乘以2200000

巧算帮忙64*125x25解:根据拆分法和结合律的运用,原式=(8x4x2)x125x25=(8x125)x(4x25)x2=1000x100x2=10000x2=20000

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