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求速解一道数学题,高手帮帮我啊!!!!!!!在线等~~
一堆煤,烧掉总数的40%,又运进24吨,这时,存煤是原来总数的2/3,这堆煤原来有多少吨?急急急!!!!!!!!!!!!!!!!!!!!...
一堆煤,烧掉总数的40%,又运进24吨,这时,存煤是原来总数的2/3,这堆煤原来有多少吨?
急急急!!!!!!!!!!!!!!!!!!!! 展开
急急急!!!!!!!!!!!!!!!!!!!! 展开
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24÷(2/3+40%-1)
=24÷(2/5-1/3)
=24÷1/15
=24×15
=360吨
=24÷(2/5-1/3)
=24÷1/15
=24×15
=360吨
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