简便计算 5/6除4+1/6乘1/4 510除[42乘(5/6减3/7)] 明明在计算3乘(1/5加□) 10
简便计算5/6除4+1/6乘1/4510除[42乘(5/6减3/7)]明明在计算3乘(1/5加□)减1/4时,把括号弄丢了,计算结果是3/4,请问正确结果应该是多少?...
简便计算
5/6除4+1/6乘1/4
510除[42乘(5/6减3/7)]
明明在计算3乘(1/5加□)减1/4时,把括号弄丢了,计算结果是3/4,请问正确结果应该是多少? 展开
5/6除4+1/6乘1/4
510除[42乘(5/6减3/7)]
明明在计算3乘(1/5加□)减1/4时,把括号弄丢了,计算结果是3/4,请问正确结果应该是多少? 展开
1个回答
2016-11-17
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5/6÷4+1/6×1/4
=5/6×1/4+1/6×1/4
=(5/6+1/6)×1/4
=1×1/4
=1/4
————
510÷[42×(5/6-3/7)]
=510÷42÷(5/6-3/7)
=510÷42÷17/42
=510×1/42×42/17
=30
————
3×1/5+x-1/4=3/4,
x=3/4+1/4-3/5=2/5,
所以3×(1/5+3/5)-1/4
=3×4/5-1/4
=12/5-1/4
=43/20,
正确结果43/20
=5/6×1/4+1/6×1/4
=(5/6+1/6)×1/4
=1×1/4
=1/4
————
510÷[42×(5/6-3/7)]
=510÷42÷(5/6-3/7)
=510÷42÷17/42
=510×1/42×42/17
=30
————
3×1/5+x-1/4=3/4,
x=3/4+1/4-3/5=2/5,
所以3×(1/5+3/5)-1/4
=3×4/5-1/4
=12/5-1/4
=43/20,
正确结果43/20
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