420/(645-610)怎么简算?
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![420/(645-610)怎么简算?](/uploads/image/z/436931-35-1.jpg?t=420%2F%EF%BC%88645-610%EF%BC%89%E6%80%8E%E4%B9%88%E7%AE%80%E7%AE%97%3F)
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420/(645-610)怎么简算?
420/(645-610)怎么简算?
420/(645-610)怎么简算?
420/(645-610)
=420/35
=(350+70)/35
=350/35+70/35
=10+2
=12
2×21×10 / 7×5
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