X:Y:Z:U=1:2:3:4 9X+7Y+3Z+2U=200是一的方程组
X:Y:Z:U=1:2:3:4 9X+7Y+3Z+2U=200是一的方程组
数学人气:510 ℃时间:2020-05-13 22:10:39
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因为X:Y:Z:U=1:2:3:4 所以Y=2X,Z=3X,U=4X 9X+7Y+3Z+2U=200 9X+14X+9X+8X=200 40X=200 X=5 所以Y=10,Z=15,U=20
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