简化(3-2x)(4 5x)
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/26 15:38:53
=sinx/2+根号3cosx/2+sinx-根号3cosx-根号3(-cosx/2+根号3sinx/2)=3sinx/2-根号3cosx/2+根号3cosx/2-3sinx/2=0
4X^2-5X+6+2X^2+7X-4=6x^2+2x+2
x2-1x2+2x÷x-1x=x2-1x2+2x•xx-1=(x-1)(x+1)x(x+2)•xx-1=x+1x+2,x+2<1①2(x-1)>-6②,解不等式①,得x<-1.
(1+x)/(2+x)符号小于0
原式=x−22(x−3)÷−(x−2)(x+2)x−3=x−22(x−3)×x−3−(x−2)(x+2)=1−2(x+2),当x=2-2时,原式=-122=-24.
(x^2+3x+1)(x^3+x^2-2)+3x^4+4x^2+5=x^5+x^4-2x^2+3x^4+3x^3-6x+x^3+x^2-2+3x^4+4x^2+5=x^5+7x^4+4x^3+3x^2
原式=-x+2/1x-2-2/1x+1=-x-1=-2/1-1=-2/3
1.(x-2y)^2+14(2y-x)+49=(x-2y)^2-2*7*(x-2y)+49=(x-2y-7)^22.(x+2y)^3-(x+2y)=(x+2y)[(x+2y)^2-1]=(x+2y)(
√(x-1/x)²+4=√(x²-2+1/x²)+4=√[(x²+2+1/x²)-4]+4=√[(x+1/x)²-4]+4=√[(-3)
第一个=3-2(x^2-x-2)-x^2+3(x^2-x-6)=-x-11其中x=99时,原式=-110第二个两边分别把括号打开x^3+2x^2+2x+1-x^3+2x^2-2x+1=4x^2-2x-
(x+y)+(2x+y/2)+(3x+y/2*3)+(4x+y/3*4)+.+(8x+y/8*9)=(x+2x+3x+...+8x)+y[1+(1/2)+1/(2×3)+1/(3×4)+...+(1/
1/6X根号18x-x²根号1/2x=1/2x√2x-1/2x√2x=0
5x+7—4x—0.185x+7+(—4x)+(—0.18)x-6.82
晕菜sec^2x=tan^2x+1代入即可.
因为y为负数,x为正数,所以y-x0,由此化简为|x-y+1|-2|y-x-3|+|y-x|+5=x-y+1+2y-2x-6-y+x+5=0
前面怎么是两个平方数呢?是x²+x-1吧.这式子看着还行啊你想乘开来还是继续因式分解呢?再问:对,就是(x²+x-1)(2x²-x+2)就是简化再答:2x^4+x^3-x
x²+3x+3x+9=x(x+3)+3(x+3),提取公因式(x+3),(x+3)(x+3),得(x+3)²,记住就好了
0.017*5*4*8=0.001*17*16=0.001*(16^2+16)=0.001*(256+16)=0.272