要把含盐10%的盐水40千克改制成含盐20%的盐水,怎么办? 问题:(1)_(2)_.
要把含盐10%的盐水40千克改制成含盐20%的盐水,怎么办?
问题:(1)______(2)______.
问题:(1)______(2)______.
数学人气:891 ℃时间:2020-04-28 23:24:29
优质解答
(1)设蒸发掉水X千克,40×10%=(40-X)×20%, 8-0.2X=4, 0.2X=4, X=20;(2)设加盐X千克,40-40×10%=(40+X)-(40+X)×20%,40+X-8-0.2X=36, ...
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