1、-0.2(5x^2+1)
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1、-0.2(5x^2+1)
2、-3(2x-1)+7X
3、-3(2x-2/3Y^2)+2(-3/2x+Y^2)
3、先化简,再求值.
(t+3t^2-3)-(-t+4t^2),其中t=-1
4、2(x+y)-2/3(x-y)-3(x+y)+2/3(x-y) ,其中x=-2,y=1.
感激不尽啊!
2、-3(2x-1)+7X
3、-3(2x-2/3Y^2)+2(-3/2x+Y^2)
3、先化简,再求值.
(t+3t^2-3)-(-t+4t^2),其中t=-1
4、2(x+y)-2/3(x-y)-3(x+y)+2/3(x-y) ,其中x=-2,y=1.
感激不尽啊!
1、-0.2(5x^2+1)
=-x²-0.2
2、-3(2x-1)+7X
=-6x+3+7x
=x+3
3、-3(2x-2/3Y^2)+2(-3/2x+Y^2)
=-6x+2y²-3x+2y²
=-9x
3、先化简,再求值.
(t+3t^2-3)-(-t+4t^2),其中t=-1
(t+3t^2-3)-(-t+4t^2)
=t+3t²-3+t-4t²
=-t²+2t-3
当t=-1时 原式=-1-2-3=-6
4、2(x+y)-2/3(x-y)-3(x+y)+2/3(x-y) ,其中x=-2,y=1.
2(x+y)-2/3(x-y)-3(x+y)+2/3(x-y)
=-(x+y)
=-x-y
当x=-2,y=1时
原式=2-1=1
=-x²-0.2
2、-3(2x-1)+7X
=-6x+3+7x
=x+3
3、-3(2x-2/3Y^2)+2(-3/2x+Y^2)
=-6x+2y²-3x+2y²
=-9x
3、先化简,再求值.
(t+3t^2-3)-(-t+4t^2),其中t=-1
(t+3t^2-3)-(-t+4t^2)
=t+3t²-3+t-4t²
=-t²+2t-3
当t=-1时 原式=-1-2-3=-6
4、2(x+y)-2/3(x-y)-3(x+y)+2/3(x-y) ,其中x=-2,y=1.
2(x+y)-2/3(x-y)-3(x+y)+2/3(x-y)
=-(x+y)
=-x-y
当x=-2,y=1时
原式=2-1=1
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
化简 x(x-1)+2x(x+1)-3x(2x-5)
x(x平方-1)+2X平方(X+1)-3X(2X-5)帮个忙
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
(x-1)/x -(1-x)/(x+1)=(5x-5)/(2x+2) x等于多少
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
化简(2x-5)(3x+2)-6(x+1)(x-2),其中x=0.2
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)