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30道方程组带过程

x^2-2x-80=0 答案:x1=-8 x2=10 (x+8)(x-10) (4)x^2+10x-200=0 答案:x1=-20 x2=10 (x+20)(x-10) (5)x^2-20x+96=0 答案:x1=12 x2=8 (x-12)(x+8) (6)x^2+23x+76=0 答案:x1=-19 x2=-4 (x+19)(x+4) (7)x^2-25x+154=0 答案:x1=14 x2=11 (x-14)(x+1)

增广矩阵 (a, b) =[1 1 0 0 5][2 1 1 2 1][5 3 2 2 3]行初等变换为[1 1 0 0 5][0 -1 1 2 -9][0 -2 2 2 -22]行初等变换为[1 0 1 2 -4][0 1 -1 -2 9][0 0 0 -2 -4]行初等变换为[1 0 1 0 -8][0 1 -1 0 13][0 0 0 1 2]r(a, b) = r(a) = 3 评论0 0 0

(1) 3X-(1/2+1/4)=7/12 3X=7/12+3/4 3X=4/3 X=4/9 (2) 6.6-5X=3/4-4X 6.6-0.75=-4X+5X X=5.85 (3) 1.1X+2.2=5.5-3.3X 1.1X+3.3X=5.5-2.2 4.4X=3.3 X=3/4=4/3 (4)3x-3=1 x=4/3 (5)5x-3x=4 x=2 (6)3x+7=28 x=7 (7)3x-7=26 x=11 (8)9x-x=16 x=2 (9)24x+

1题:10 x + 90 = 290 10 x = 290-90x= 200/10x= 202题:10 x + 91 = 291 10 x = 291-91x= 200/10x= 203题:10 x + 92 = 292 10 x = 292-92x= 200/10x= 204题:10 x + 93 = 293 10 x = 293-93x= 200/10x= 205题:10

2(x-2)-3(4x-1)=9(1-x) 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x) 3(x-7)-2[9-4(2-x)]=22 3/2[2/3(1/4x-1)-2]-x=2 2(x-2)+2=x+1 5x^2+3x+1=0 7x^2+x+12=0 2x^2+4x+4=0 8x^2+3x+1=0 5x^2+3x+2=0 45x^2+3x+100=0 89x^2+335x+1=0 x+1=3 2x+3=5 3x+5=8

(1) 66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案:x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案:x=98 y=51 (5) 67x+54y=8546 71x-y=5

7X+6=8-3X 4X 3(20-X)=6X-7(9-X) 2(X-2)-3(4X-1)=9(1-X) 1-4(X+3)=3(X+2) 4(X-2)-[5(1-2X)-4(5X-1)]=0 2X+3(2X-1)=16-(X+1) 3X+1-2X-1=1 3X+1-2X-1=6 3(X+1)-2(X-1)=1 3(X+1)-2(X-1)=6 3X-1-4X+3=6 3X-3-4X-6=6 3X+1-4X-3=6 3X-1+4X-6=6 54+X=2(48-X) 48+X=2(54-X) 54-X=2*48 48+X=2*54

2x+3x=605x=60 x=123.6x-2.8x=120.8x=12 x=15100x-x=19899x=198 x=218x+2x=6020x=60 x=35x+6x=12.111x=12.1 x=1.16.6x-5x=81.6x=8 x=54x-x=243x=24 x=81.5x-x=10.5x=1 x=21.9x+0.4x=9.22.3x=9.2 x=425x-5x=10020x=100 x=580x-40=(30x+40)*280x-40=60x+8020x=120 x=680x-3200=60x+120020x=4400 x=220

8x=0.12 3x+48=168 3x-x=156 3x+11=5x-5 3.8x=17.48 x÷6.7=19.43 3x+1.5x=135 100-5x=93 x+12.8=30 55-x=32.76 x÷70=4.9 5.6x=78.4 18x+21=48 8x-4x=56 3.6x+2.2x=63.8

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