1 7{1 2[1 5(X-2 2 1)-1] X}=1

X/X×（1/12+1/15）×X×（1/12-1/15）=60X/X×9/60×X×1/60=60X/9X/60×X/60=60X×60/9X×X/60=6060/9×X/60=60X/9=60X=

这是一个问题还是分开的啊?再问：feikai再答：/代表几分之几,*代表乘号1.3x+8y=12①14x+5y=12②②-①=11x-3y=011x=3y11/3*x=y再代入①里计得x,再代入②再问

=x^18+x^15+x^12+x^9+x^6+x^3+1+x^3-1+5-4分解因式把下面的18换成21就是了=(x^18+1)+(x^15+1)+(x^12+1)+(x^9+1)+(x^6+1)+

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

9X-3.2X=8.125.8X=8.12X=8.12÷5.8X=1.415分之4：X=1.36:171.36X=17×4/151.36X=68/15X=68/15÷1.36X=10/3

X-10=(X+50)乘以1/4X-10=0.25X+12.50.75X=22.5X=30

如图,两个实数解,x=-2.21946和0.0326566这是个20次的方程,基本没法用手算的.

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

(5X-15)-(2X+3)=X+123x-18=x+122x=30x=15

同时乘6060×（x/15+x/12+x/10）=1365×604x+5x+6x=8190015x=81900x=81900÷15x=5460很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选

主要是考察因式分解这方面的技能啊![(2x²-5x+2)/(6x²+13x+6)]*[(6x²-5x-6)/(6x²-17x+10)]*[(12x²+

15(x-12)-13x=102015x-180-13x=10202x=1200x=600

x+25%x=25001.25x=2500x=2000x-12%x=4.40.88x=4.4x=545%x+15%x=360.6x=36x=60120%x-x=560.2x=56x=28048%x-1

x²-2x=5x²-2x-5=0x四次方+3x³-12x²-31x-15=x的4次方-2x³-5x²+5x³-10x²-

前面那些看不懂.-1.5x=18*2-1.5x=36x=-24再问：x=4x=2545x-x=1803x+x=1615x-11x=12.8(12+12*1.5)x=3603.5(85=X)=560(x

【不好意思,题目太难让我想了很久】储备知识：x^n-y^n=(x-y)【x^(n-1)+x^(n-2)y+x^(n-3)y²+……+x²y^(n-3)+xy^(n-2)+y^(n-

原式=2/(x+1)(x+3)+2/(x+3)(x+5)+2/(x+5)(x+7)=1/(x+1)-1/(x+3)+1/(x+3)-1/(x+5)+1/(x+5)-1/(x+7)=1/(x+1)-1/

原式=(x-1)(x^15+x^14+……+1)/(x-1)=(x^16-1)/(x-1)=(x^8+1)(x^4+1)(x²+1)(x+1)(x-1)/(x-1)=(x^8+1)(x^4+

x^3+x-30(分解因式)=(x^3-27)+(x-3)=(x-3)(x^2+3x+9)+(x-3)=(x-3)(x^2+3x+9+1)=(x-3)(x^2+3x+10);x^12-y^12;=(x

15(180-X)=12X2700=27XX=100这是我在静心思考后得出的结论,如果不能请追问,我会尽全力帮您解决的~如果您有所不满愿意,请谅解~