x²-4x-12=0怎么得(x-6)(x 2)=0
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4x-2=3-x移项得4x+x=3+2化简得5x=5解得x=1
4(x+12)=10x+124X+48=10X+12移项得10X-4X=48-12得6X=36得X=6
这个不还解决0.906-0.8520.287-0.609*i-1.735*i-0.5641.735*i-0.5640.609*i+0.287你看可以吗?
60+x=4x(12+x)60+x=48+4x4x-x=60-483x=12x=4
即x²-5x=-1所以原式=x³-5x²+x²-5x+x-1=x(x²-5x)+(x²-5x)+x-1=-x-1+x-1=-2
(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分
3x-5/2x+1>=-53x-5>=-5(2x+1)(x>-1/2)13x>=0x>=0或3x-5
x(x-1)≥0X与X-1必须同号(同时>=0或=0时X-1>=0时,x>=1同时
x^4-4x^3-4x^2+15x+18=0x^4-3x^3-x^3+3x^2-7x^2+21x-6x+18=0(x-3)(x^3-x^2-7x-6)=0x1=3x2=3.49449283705542
题目应是1/(x^2+x﹚+1/(x^2+3x+2﹚+1/(x^2+5x+6﹚+1/(x^2+7x+12﹚=4/211/x(x+1﹚+1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)
先通分为分母是84原式变为14X/84+7X/84+12X/84+5+42X/84+4=84X/84移项得(84-14-7-12-42)X/84=5+49X/84=9X=9*84/9=84
原式:-10x²+4x+1=5x+2x²-2→移向(将左边项移到右边,注意变号)→10x²+2x²+5x-4x-2-1=0→12x²+x-3=0,希望
(x+12)*(x+12)=x*x+360x*x+144+24x=x*x+36024x=360-144=216x=216/24=9楼下的你复制我的做什么
X/(X+4)=4/77x=4(x+4)7x=4x+163x=16x=16/3应该是这样子的,希望你能看懂,祝你学习进步
x/(1/4)+x/(3/7)+x/(3/5)=3604x+7x/3+5x/3=360(4+7/3+5/3)x=3608x=360x=360/8x=45
令y-x=ky=x+k代入圆方程,得x平方+(x+k)平方-4x+1=02x平方+(2k-4)x+k平方+1=0因为最大,所以△=(2k-4)平方-4×2×(k平方+1)=04k平方-16k+16-8
=x^2002(x^4+x^3+x^2+x+1)=0提取公因式就行了