6x加18等于48
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x²+3x-1=0x²=-3x+1所以x³=x×x²=x(-3x+1)=-3x²+x=-3(-3x+1)+x=10x-3原式=(10x-3)+5(-3
3x+x=184x=18x=4.5x/3+x=184x/3=184x=54x=13.5
1/(x+5)-1/(x+6)=1/(x+7)+1/(x+8)1/(x+5)-1/(x+7)=1/(x+8)-1/(x+6)2/(x+5)(x+7)=2/(x+8)(x+6)(x+5)(x+7)=(x
1/(x+4)-1/(x+7)=1/(x+3)-1/(x+6)(x+3)(x+6)(x+7)-(x+3)(x-6)(x+4)=(x+4)(x+7)(x+6)-(x+4)(x+7)(x+3)(x+3)(
X+6X=567X=56X=8
x=2y+3(1)3x+y=6(2)把(1)式代入(2)得:3(2y+3)+y=66y+9+y=67y=-3y=-3/7把y=-3/7代入(1)式得:x=15/7综上:x=15/7y=-3/7
对再答:求采纳
A=6X=10Y=8
(x-1)(x+2)(x+3)(x+6)+20=0(x-1)(x+6)(x+2)(x+3)+20=0(x^2+5x-6)(x^2+5x+6)+20=0(x^2+5x)^2-36+20=0(x^2+5x
x=59又
4X+2=18求出4x=16x=4所以6x+1等于25
@44.001
6(X+15)=906X+90=906X=90-90X=0
6X+20=4X+406X-4X=40-202X=20X=10
(x+8)/(x+7)+(x+9)/(x+8)=(x+7)/(x+6)+(x+10)/(x+9)(x+8)/(x+7)-(x+7)/(x+6)=(x+10)/(x+9)-(x+9)/(x+8)1+1/
3*x+6=83x=2x=2/3