[3x+8y=14 x+5y=12 ] [ 8x-2y=36 3X+y=17 ] [ x+5y=15 5x-y=49 ] 5x-3y=5 13x-2y=42 代入法求
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[3x+8y=14x+5y=12][8x-2y=363X+y=17][x+5y=155x-y=49]5x-3y=513x-2y=42代入法求[3x+8y=14x+5y=12][8x-2y=363X+y
[3x+8y=14 x+5y=12 ] [ 8x-2y=36 3X+y=17 ] [ x+5y=15 5x-y=49 ] 5x-3y=5 13x-2y=42 代入法求
[3x+8y=14 x+5y=12 ] [ 8x-2y=36 3X+y=17 ] [ x+5y=15 5x-y=49 ] 5x-3y=5 13x-2y=42 代入法求
[3x+8y=14 x+5y=12 ] [ 8x-2y=36 3X+y=17 ] [ x+5y=15 5x-y=49 ] 5x-3y=5 13x-2y=42 代入法求
这是一个问题还是分开的啊?
12y(x-y)^2-8(x-y)^3=?
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(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
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请解答方程组:(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3ax+3y=7 2x-y=8 3x+4y=17 3x-5y=11(43)3x+y=82 (44)3(x-1)=y+5 45 x/4+y/3=7 (46)x+y/3 +x-y/2=610x-11y=87 5(y-1)=3(x+5) 2/3x+y/2=14 3(x+y-)2(x-y)=28
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例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3
导数的计算练习题导数的计算(1)y=x^5 (2)y=sinx(3)y=1/x^3(4)y=5^√x(5)y=cosx(6)y=5^x(7)y=log3^x(8)y=lnx(9)f(x)=x^3-x^2-x+1(10)y=2x^3-3x^2+4x-1(11)y=x inx(12)y=xsinx-cosx(13)y=cosx/x(14)y=3x(x^2+2)(15)f(x)=(x-1)^2+3(x-1)(16)f(x)=1
(x+y)/y=8/3则x/y=__ y/x-y=___
(x+y)/y=8/3则x/y=__ y/x-y=___
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(5x+3y)(3y-5x)-(4x-y)(4y+x)=