x+y=200100x:1.5*100y=3:4
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x+y=200
100x:1.5*100y=3:4
y=200-x
100x:150(200-x)=3:4
400x-450(200-x)=0
40x-9000+45x=0
85x=9000
x=1600/17
y=...
daan maosi buzhengque
x+y=200
100x:1.5*100y=3:4
由100x:1.5*100y=3:4有 400x=450y 即x=9y/8 带入 x+y=200
9y/8+y=200 解得y=1600/17 x=1800/17
x+y=200
y = 200 - x ...①
100x:1.5*100y=3:4
100x×4 = 1.5·100y×3【比例式的性质】
400x = 450y
8x = 9y 【两边约去50】 ...②
把①代入②,有
8x = 9(200-x)
8x = 1800 - 9x
17x = 1800
x = 18...
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x+y=200
y = 200 - x ...①
100x:1.5*100y=3:4
100x×4 = 1.5·100y×3【比例式的性质】
400x = 450y
8x = 9y 【两边约去50】 ...②
把①代入②,有
8x = 9(200-x)
8x = 1800 - 9x
17x = 1800
x = 1800/17 ...③
把③代入①,有
y = 200 - x
= 200 -1800/17
= (3400-1800)/17
= 1600/17
从而x = 1800/17 且 y = 1600 /17
(如果需要小数作答,则为x≈105.9 y≈94.1 )
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