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125x15x18脱式计算

125×15×4 =(25×5)×15×4 =(25×4)×(5×15) =100×75 =7500

解:88x125 =8x125x11 =1000x11 =11000 分析:本题简便计算的关键在于要利用8x125=1000的常用式子,然后将88分解成8x11.而后就可算出结果是11000.

(3500―25x125)÷25=( )脱式计算 (3500―25x125)÷25 =3500÷25-25×125÷25 =35×(100÷25)-25÷25×125 =35×4-125 =140-125 =15

125x64 =125x8x8 =1000x8 =8000

42×125×8×5 =(42x5)x(125x8) =210x1000 =210000 23×5×2 =23x(5x2) =23x10 =230 25×9×4 =(25x4)x9 =100x9 =900 15×162×2 =(15x2)x162 =30x162 =4860 (250×125)×(4×8) =(250x4)x(125x8) =1000x1000 =1000000 供参考。

125x56 =125×8×7 =1000×7 =7000

125x30x24 =125x30x(8*3) =125*8*3*30 =1000*90 =90000

798x125 =(800-2)x125 =800x125-2x125 =100000-250 =999750

(40 8)x125的脱式计算 (40 8)x125 =125*40+125*8 =5000+1000 =6000

34×3.535-3.5×34.34 =34×3.5×1.01-3.5×34×1.01 =0 8+89+899+8999+89999 =9+90+900+9000+90000-5 =99999-5 =99994 0.67×2.1+0.018×21+8.5×0.79 =0.67×2.1+0.18×2.1+8.5×0.79 =(0.67+0.18)×2.1+8.5×0.79 =0.85×2.1+0.85×7.9 =0.85×(2.1+7.9) =...

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