1x1/2+2x1/3,加3x1/4+4x1/5+5x1/6+1/67等于多少?
脱式计算是一个数学学科术语,即递等式计算,把计算过程完整写出来的运算,也就是脱离竖式的计算。
1x1/2+2x1/3+3x1/4+4x1/5+5x1/6+6x1/7
=1/2+2/3+3/4+4/5+5/6+6/7
=6-(1/2+1/3+1/4+1/5+1/6+1/7)
=6-(3/4+3/6+12/35)
=6-(5/4+12/35)
=6-(175/140+48/140)
=6-223/140
=840/140-223/140
=617/140。
1x1/2+2x1/3+3x1/4+4x1/5+5x1/6+6x1/7
=1/2+2/3+3/4+4/5+5/6+6/7
=6-(1/2+1/3+1/4+1/5+1/6+1/7)
=6-(3/4+3/6+12/35)
=6-(5/4+12/35)
=6-(175/140+48/140)
=6-223/140
=840/140-223/140
=617/140。
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