(x-12) 8=66-搜答案-神马作文网

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

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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

（8+x)+(28+x)+(39+x)+(53+x)+(32+x)+(66+x)+(9+x)=3807x+(8+28+39+53+32+66+9)=3807x+(75+85+75)=3807x+235

(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

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

x²+x-12=0a=1,b=1,c=-12△=b²-4ac=1²-4×1×(-12)=1+48=49√△=√49=7x=(-b±√△)/(2a)=(-1±7)/2x1=

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

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

x-0.4x=360.6x=36x=36÷0.6x=602y-66=282y=66+28=94y=94÷2y=478x-6x=1402x=140x=140÷2x=7012x÷4=723x=72x=72