y=x^2cosx的导数RT

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y=x^2cosx的导数RT
y=x^2cosx的导数
RT

y=x^2cosx的导数RT
y'=(x²)'*cosx+x²*(cosx)'
=2xcosx-x²sinx

3x-y=4 (1)
x+2y=10 (2)
(1)*2)+(2)
6x-2y+x+2y=4*2+10
7x=18
x=18/7
y=3x-4=26/7
y+2=3(x-1)
3x-y=5 (1)
2(y-1)-(x+3)=5
x-2y=-10 (2)
(1)*2-(2)
6x-2y-x+2...

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3x-y=4 (1)
x+2y=10 (2)
(1)*2)+(2)
6x-2y+x+2y=4*2+10
7x=18
x=18/7
y=3x-4=26/7
y+2=3(x-1)
3x-y=5 (1)
2(y-1)-(x+3)=5
x-2y=-10 (2)
(1)*2-(2)
6x-2y-x+2y=5*2-(-10)
5x=20
x=4
y=3x-5=7
x/2+y/3=1 (1)
x/3-y=3 (2)
(1)*3+(2)
3x/2+y+x/3-y=3+3
x=36/11
y=x/3-3=-21/11

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