1.2x2.5 0.8x2.5

1.2x2.5+0.8x2.5怎样简算1.2x2.5+0.8x2.5怎样简算1.2x2.5+0.8x2.5怎样简算1.2x2.5+0.8x2.5=（1.2+0.8）x2.5=2x2.5=51.2x2.

4x2.5x2+4x2×2+2x2.5x2=4x2.5x2+4x2×2+2x2.5x2=4x2.5x2+4x2×2+2x2.5x2=46

1.2x2.5+2.8x2.5简便计算1.2x2.5+2.8x2.5简便计算1.2x2.5+2.8x2.5简便计算1.2x2.5+2.8x2.5=（1.2+2.8）x2.5=4x2.5=10解1.2x

15X2/5X2/5X2/5=15X2/5X2/5X2/5=15X2/5X2/5X2/5=二十五分之二十四5x2-2x-15x2-2x-5=x+5-1x，∵5x2-3x=5，两边同除以5x得：x-1x

4x2-3y2+2xy-4x2+5x24x2-3y2+2xy-4x2+5x24x2-3y2+2xy-4x2+5x24x2-3y2+2xy-4x2+5x2=5x²+2xy-3y²=(

x2-5x+1=0则x2+x2/1x2-5x+1=0则x2+x2/1x2-5x+1=0则x2+x2/1你可以参见“韦达定理”方程两个根的积是1,说明他们互为倒数.x^2+1/x^2=(x+1/x)^2

2+5x2+5x2=?2+5x2+5x2=?2+5x2+5x2=?22

1.5x2.5+2.5x2.5简算1.5x2.5+2.5x2.5简算1.5x2.5+2.5x2.5简算1.5x2.5+2.5x2.5=2.5x(1.5+2.5)=2.5x4=10如果本题有什么不明白可

不等式(x2-4x-5)(x2-8)不等式(x2-4x-5)(x2-8)不等式(x2-4x-5)(x2-8)(x²-4x-5)(x²-8)<0(x+1)(x-5)(x+2√2

x2-1/x2-5x+6x2-1/x2-5x+6x2-1/x2-5x+6是解不等式：（x^2-1)/(x^2-5x+6)

3x2.5x2=多少?3x2.5x2=多少?3x2.5x2=多少?等于15啊亲.151515=3*(2.5*2)=3*5=15

maxz=2x1+x2,5x2maxz=2x1+x2,5x2maxz=2x1+x2,5x2你等会,代码马上奉上maxz=[];forx2=0:0.1:3forx1=-15:0.1:5if(((3*x1

5(x2-x)=3(x2+x)5(x2-x)=3(x2+x)5(x2-x)=3(x2+x)5(x2-x)=3(x2+x)5x^2-3x^2-5x-3x=02x^2-8x=02x(x-4)=02x=0x

(1-x2)(x2-4x+5)(1-x2)(x2-4x+5)(1-x2)(x2-4x+5)因为（x2-4x+5）是永远大于零的,它的b2-4ac

不等式（x2-4x-5)(x2+1)不等式（x2-4x-5)(x2+1)不等式（x2-4x-5)(x2+1)因为x2+1>0所以x2-4x-5（x2-4x-5)(x2+1)(x-5)(x+1)(x^2

-5X2-6等于-5X2-6等于-5X2-6等于-5*2-6=-10-6=-（10+6）=-16希望我的回答对你有用,望及时采纳为满意答案.-5X2-6等于=-10-6=-16

5X2+4=?5X2+4=?5X2+4=?5X2+4=14请采纳5X2+4=14--------------14吧吧吧5*2+4=14，就是这个数

x2-5x+6x2-5x+6x2-5x+6x^2-5x+6≤0(x-2)(x-3)≤02≤x≤3X(x-2)(x-3)根据函数图像，开口向上，所以是：2x²-5x+6=(x-2)(x-3)x

x2-5x+6x2-5x+6x2-5x+6x^2-5x+6

x2-5x+8x2-5x+8x2-5x+8x2-5x+8(x-5/2)²+8-25/4(x-5/2)²+7/4因为(x-5/2)²>=0(x-5/2)²+7/4