x减0.8x减6
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![x减0.8x减6](/uploads/image/f/900209-65-9.jpg?t=x%E5%87%8F0.8x%E5%87%8F6)
根(x²-6x+9)+根(x²-4x+4)+根(x²-10x+25)=|x-3|+|x-2|+|x-5|;当x<2时,x-3<0,x-2<0,x-5<0.所以原式=3-x
7x-x²=6x^2-7x+6=0(x-1)(x-6)=0x=1,x=6
x^4-x²=6x^4-x²-6=0(x²+2)(x²-3)=0(x²+2)(x+√3)(x-√3)=0∵x²+2≥2∴x1=-√3,x2=
6/x=x-56=x(x-5)x^2-5-6=0(x-6)(x+1)=0x1=6x2=-1再问:^是什么再答:^2是平方
6x加2x的平方减3x加x平方加1=3x^2+3x+1,代入X=-5时,其值=61
x-6/x=40x^2-40x-6=0(x-20)^2=406x-20=土√406x1=20+√406x2=20-√406.
(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
2x²-3x=(1/2)(x²-6x)4x²-6x=x²-6x3x²=0得x=0
要过程吗再问:要再答:第一个:0.5x减6等于130.5x等于19x等于38再问:第二个再答:我去写一下,这个比较麻烦再问:速度再答:再问:是1.35再问:不是135再答:是一点三五再答:蓝色笔
原式=x(x-9)/x(x+3)-(x+3)(x-3)/(x-3)²=(x-9)/(x+3)-(x+3)/(x-3)=(x²-12x+27-x²-6x-9)/(x+3)(
X/1.3=X-6x=1.3X-7.80.3X=7.8X=26
x/x-3减x+6/x^2-3x加3/x=[x*x-(x+6)+3(x-3)]/x(x-3)=(x^2-x-6+3x-9)/x(x-3)=(x^2+2x-15)/x(x-3)=(x+5)(x-3)/x
3X-X-5X=X(3-1-5)=X(2-5)=-3X
/>x²+1/x²=x²+1/x²-2+2=(x-1/x)²+2=6²+2=38再问:x的平方加3x加1=0,求x的平方加1/x的平方,x的
x-0.8x=220.2x=22x=110不懂可追问满意请采纳谢谢再问:为什么是0.2x呢?怎么理解呢?再答:x-0.8x=221*x-0.8x=22x(1-0.8)=220.2x=22
x^2-x=6x^2-x-6=0(x-3)(x+2)=0x-3=0,x+2=0x1=3,x2=-2
X=4原式=(X-1)/(X-2)-(X-2)/(X-3)=(X-4)/(X-5)-(X-5)/(X-6)左边通分=[X^2-4X+3-X^2+4X-4]/[(X-2)(X-3)]=-1/[(X-2)