①(-5/8)×(-4)⒉-0.25*(-5)*(-4)⒊ ②3x⒉+4x⒉-2x-2(x+2x-1)-x+1其中x=-
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①(-5/8)×(-4)⒉-0.25*(-5)*(-4)⒊ ②3x⒉+4x⒉-2x-2(x+2x-1)-x+1其中x=-2 ③2x⒉-5x+x⒉+4x其中x=-3
①(-5/8)×(-4)⒉-0.25*(-5)*(-4)⒊
=(-5/8)×16-0.25×(-4)×(-5)×(-4)²
=-5×2+1×(-5)×16
=-10-80
=-90
②3x²+4x²-2x-2(x+2x-1)-x+1其中x=-2
=7x²-2x-2(3x-1)-x+1
=7x²-2x-6x+2-x+1
=7x²-9x+3
=7×4-9×2+3
=21
③2x⒉-5x+x⒉+4x其中x=-3
=3x²-x
=3×(-3)²-3×(-3)
=27+9
=36
⒉是平方吗
=(-5/8)×16-0.25×(-4)×(-5)×(-4)²
=-5×2+1×(-5)×16
=-10-80
=-90
②3x²+4x²-2x-2(x+2x-1)-x+1其中x=-2
=7x²-2x-2(3x-1)-x+1
=7x²-2x-6x+2-x+1
=7x²-9x+3
=7×4-9×2+3
=21
③2x⒉-5x+x⒉+4x其中x=-3
=3x²-x
=3×(-3)²-3×(-3)
=27+9
=36
⒉是平方吗
先化简,再求值:x^3+2x^2+x/x^2+2x-8除以(x/x-2 × x+1/x+4),其中x=负5/4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
先化简再求值:(x-4)(x-2)-(x-1)(x-3)其中x=-5/2
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3
解方程 x(2x-4)+3x(x-1)=5x(x-3)+8