60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个怎么接出来的x.y值
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60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个怎么接出来的x.y值
60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个
60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个怎么接出来的x.y值
60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个怎么接出来的x.y值
60+(1.5x-10)y=109.5
∴ (1.5x-10)y=49.5 ③
60+(x-10)y=78
∴ (x-10)y=18 ④
③:④得
(1.5x-10):(x-10)=49.5:18
18 (1.5x-10)=49.5 (x-10)
27x-180=49.5x-495
315=22.5x
解得,x=14
代入④中,解得y=4.5
60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个60+(1.5x-10)y=109.5 60+(x-10)y=78 x=14 y=4.5 这个怎么接出来的x.y值
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[(x-y)²+(x+y)(x-y)]/2xx=3,y=-1.5
{x/60+y/80=10,x/60+y/40=15、{2x/3+3y/4=1/5,5x/6-5y/2=2、{5/2(x+y)=1200,10/3(x+y)=1200{4x+5y=98,5y-4x=2、{x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x
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若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
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