能简算简算
1个回答
2016-03-01
展开全部
(1)
= (51÷17)×(78÷13)×2×(34÷31)
= 3×6×2×(1+3/31)
= 36+108/31
= 39又15/31
(2)
432×(100-1)-568
= 432×100-432-568
= 43200-1000
= 42200
= (51÷17)×(78÷13)×2×(34÷31)
= 3×6×2×(1+3/31)
= 36+108/31
= 39又15/31
(2)
432×(100-1)-568
= 432×100-432-568
= 43200-1000
= 42200
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