(x-8) 2.4=12-搜答案-搜搜考试网

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583

1,（x+0.8)*2=2.42x+1.6=2.42x=2.4-1.62x=0.8x=0.42,7x/4=12+x7x=48+4x7x-4x=483x=48x=163,0.3x-8*0.7=0.1x0

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5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)

15x=23x-248x=24x=312+5x=3x-82x=-20x=-103(x-3)=9-(x+6)4x=9+9-6=12x=34+x=4x-173x=21x=7

(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分

3x²+2x²-3x-(-x+5x²)=3x²+2x²-3x+x-5x²=-2x其中x=314时,-2x=-2*314=-6285xy-8x

x+5.9=23.8移项得：x=23.8-5.9x=17.97x+2x=10.8合并同类项得：9x=10.8x=1.24×3+6x=54移项得：6x=54-126x=42x=718x-12x=24.6

12x=8（x+1)12x=8x+812x-8x=84x=8x=29.8-2.4X=3.2X+4.2-2.4x-3.2x=4.2-9.8-5.6x=-5.6x=1

提示,设t=（x^2+3x)/(x^2+X-4)算出t再求x

x-o.8x=6X=3012x-8x=4.8X=1.23x-8=16X=8x-0.7x=3.6X=127.5x-2x这题没有=

x/2+x/8+x/12+x/20=1

60X+15X+10X+6X=12091X=120X=120/91

(3x/24+2x/24)*3+(2x/24+x/24)y=x15x/24+3xy/24=x15x+3xy=24x9x-3xy=03x-xy=0x(3-y)=0结果：x=0或y=3

2.4x-1.4x-3x=5.2-8

（2.4-1.4-3）x=-2.8-2x=-2.8x=1.4再答：求采纳

5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/[(x+3)(x-2)]+(2x-5)/[(x-4)(x+3)]=(7x

x^2+8x+12=0

x^2+8x+12=0(x+6)(x+2)=0x+6=0x=-6x+2=0x=-2

=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8=0+90+56=146也很简单

第一题：x-x/5=2.45x-x=124x=12x=3第二题：12/5%x=8240x=8x=1/30第三题：4x+x=12.55x=12.5x=2.5

3x²=10x+83x²-10x-8=0x=(10±√(100+4×3×8)/2*3x=(10±√196)/6x=(10±14)/6∴x1=4x2=-2/33x²-10x