12.5x64x0.025简算
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12.5x64x0.025简算
![12.5x64x0.025简算](/uploads/image/z/16581107-11-7.jpg?t=12.5x64x0.025%E7%AE%80%E7%AE%97)
12.5x64x0.025
=12.5*8*8*0.025
=20
再问: 没看懂!!
再答: 12.5x64x0.025 =12.5*8*8*0.025 (12.5*8=100 要记住的速算, 8*0.025=0.2 4*25=100要记住的速算) =20
=12.5*8*8*0.025
=20
再问: 没看懂!!
再答: 12.5x64x0.025 =12.5*8*8*0.025 (12.5*8=100 要记住的速算, 8*0.025=0.2 4*25=100要记住的速算) =20