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8x 3 20 x 5x

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解:8x-3(20-x)=5x 8x-60+3x=5x 11x-60=5x 11x-5x=60 6x=60 x=10

8X-3=5X+9 解: 8X-5X=9+3 3X=12 X=4 祝学习进步。

解: A=矩阵[1,3,12 ;1,2,4;1,1,1] B=(12,8,5) X=(x1,x2,x3) AX=B X=A^(-1)*B (A,E)转换: A^(-1)=0.4000 -1.8000 2.4000 -0.6000 2.2000 -1.6000 0.2000 -0.4000 0.2000 X=2.4000 2.4000 0.2000 A1=x1+x2+x3 A2=3x1+2x2+x3 A3=12x1+4x2+x3 Z=2....

x-2/5x-3/8x=180怎么解 x-2/5x-3/8x=180 (1-16/40-15/40)x=180 9/40x=180 x=180x40/9 x=800 希望能帮到你

8x+3(x-2)=5x+(x-3); 8x+3x-6=5x+x-3; 11x-6=6x-3; 11x-6x=6-3; 5x=3; x=3/5

3/4x-3/5ⅹ=4的前面都对。后面: (15/20-12/20)x=4 3/20x=4 把等式两边同乘以20: 3/20x*20=4*20 3x=80 ⅹ=80/3

x^5-5x^4+ 8x^3-8x^2 +7x-3 =x^5-3x⁴-2x⁴+6x³+2x³-6x²-2x²+6x+x-3 =x⁴(x-3)-2x³(x-3)+2x²(x-3)-2x(x-3)+(x-3) =(x-3)(x⁴-2x³+2x²-2x+1) =(x-3)【(x⁴-2...

裂项法 3/2×5+3/5x8+3/8x11+3/11x14+3/14x17+3/17x20 =1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17+1/17-1/20 =1/2-1/20 =9/20

解:1,8*-4(60-x)=280 8-240+4X=280 4X = 280 -8 +240 X = 132 2, 5x+3(25-x)=20 5 X+ 75 -3X =20 2X = 20 -75 X = -55/2 3,8x-8*7=218 8X -56 =218 8X = 218+56 X = 137/4 4,2x+7*5=125 2X +35 =125 2X =125- 35 X = 45 5,76.5/x=8.5 76.5 =8.5X...

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