x⁴ 3x³ 11x² 9x 18-搜答案-搜搜做题作业网

1.6a=7ba:b=7:62.3×45=15×93:15=9:453.3分之2x=0.75Yx:y=0.75:2/34.8X9=4X188:4=18:8

ls强人1.原式=78÷15x18=93.62.原式=0.25x4+0.25x0.4=1+0.1=1.13.原式=7+0.28+32/25=7+7/25+32/25=8又14/254.原式=67x(3

|x-1|+|x-10|表示数轴上x到1的距离+x到10的距离.显然最小值是9,此时x只要在1到10之间就好.类似的,|x-2|+|x-9|的最小值是7,此时x在2到9之间就好.|x-3|+|x-8|

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

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

因式分解3x*x+11x+10

3x*x+11x+10＝（3x+5）(x+2)

中间错了原式=(x+2)/(x-3)(x+2)+2x/x(x-3)-(x+1)/(x-3)²=1/(x-3)+2/(x-3)-(x+1)/(x-3)²=3/(x-3)-(x+1)/

1：（40/29-11/29）×18+92=1102：x=0,y=4；x=2,y=3；x=3,y=2；x=6,y=0就这些,负数你们用不到吧

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

（2013+2012）X

提示,设t=（x^2+3x)/(x^2+X-4)算出t再求x

原式=[x(x-3)/(x-3)²][(x-5)(x-6)/x(x-5)]-1=[x/(x-3)][(x-6)/x]-1=(x-6)/(x-3)-1=(x-6-x+3)/(x-3)=-3/(

(x+2)/(x^2-x-6)+2x/(x^2-3x)-x/(x^2-6x+9)=(x+2)/[(x-3)(x+2)]+2x/[x(x-3)]-x/[(x-3)^2]=1/(x-3)+2/(x-3)-

应该是-2x²,不是-3x²3x²-x=1原式=9x^4-3x³+15x³-5x²+3x²-7x+2001=3x²(3x

x+5除以x+3加上x+11除以x+9等于x+7除以x+5加上x+9除以x+7即（x+5）/（x+3）+（x+11）/（x+9）=（x+7）/（x+5）+（x+9）/（x+7）,分析后,可知分子=分母

解方程x²+3x-9=x-11

x²+3x-9=x-11x²+3x-x-9+11=0x²+2x+2=0Δ=2²-4*1*2=-4

136487259875239146942615837693572418584961372217348695468753921359126784721894563

x^9+x^6+x^3-14

设x^3=a,则题目可变为下式:a^3+a^2+a-14=a^3-8+a^2+a-6=(a-2)(a^2+2a+4)+(a-2)(a+3)=(a-2)(a^2+2a+4+a+3)=(a-2)(a^2+

9x-12x+5x=-3x+5x=2x3x-5x-2+5x+8=-2x+5x-2+8=3x+63x+5+2x+3-7-11x=3x+2x-11x+5+3-7=5x-11x+8-7=-6x+1

不可能.第一条指令书上写错了.应该是#0X28,要用怀疑的眼光去看书.多参考参考.