4X-24=2X+20 2X(X-0.7)=4.8 0.6X+3X2.5=67.5 (X-7)除以3=8 5X-1.5X
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4X-24=2X+20 2X(X-0.7)=4.8 0.6X+3X2.5=67.5 (X-7)除以3=8 5X-1.5X8=0 0.375X8-7X=0.2 4(X+0.2)=1.2
8.7X(3.6-X)0
解方程
8.7X(3.6-X)0
解方程
4X-24=2X+20
2X=44
X=22
2X(X-0.7)=4.8
2X²-1.4X-4.8=0
X²-0.7X-2.4 =0
∵a=1.b=-0.7 c=-2.4,
Δ=(-0.7)²-4×1×(-2.4)=14.5>0
X1=(0.7+√14.5)/2×1=(0.7+√14.5)/2,
X2=(0.7-√14.5)/2×1=(0.7-√14.5)/2,
0.6X+3X2.5=67.5
8.1X=67.5
X=225/27
(X-7)除以3=8
X-7=24
X=31
5X-1.5X8=0 0.375
5X=12.0375
X=2.4075
X8-7X=0.2 4
X=0.24
(X+0.2)=1.2
2X=44
X=22
2X(X-0.7)=4.8
2X²-1.4X-4.8=0
X²-0.7X-2.4 =0
∵a=1.b=-0.7 c=-2.4,
Δ=(-0.7)²-4×1×(-2.4)=14.5>0
X1=(0.7+√14.5)/2×1=(0.7+√14.5)/2,
X2=(0.7-√14.5)/2×1=(0.7-√14.5)/2,
0.6X+3X2.5=67.5
8.1X=67.5
X=225/27
(X-7)除以3=8
X-7=24
X=31
5X-1.5X8=0 0.375
5X=12.0375
X=2.4075
X8-7X=0.2 4
X=0.24
(X+0.2)=1.2
4X-24=2X+20 2X(X-0.7)=4.8 0.6X+3X2.5=67.5 (X-7)除以3=8 5X-1.5X
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
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
2x+3x+4x+5x+x+6x+7x=100
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
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
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
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),
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