已知1除以x 1除以y=3-搜答案-智慧作业帮

17除以3除以1/6=

17除以3除以1/6=3分之17x6=34

1/x+1/y=3(3x+xy+3y)/(x—xy+y)上下同除以xy=(3/y+1+3/x)/(1/y-1+1/x)=(9+1)/(3-1)=5

把3x＋2y转化成分式.同时÷xy再算就行了

是1/x+1/y=5么?题不对吧

(3x^2y^m)^2/(2x^my)^3=(9x^4y^(2m))/(8x^(3m)y^3)=9/8x^(4-3m)y^(2m-3)(3x^2y^n)^2/2x^n-1y^n)^3=(9x^4y^(

y=1+5x除以5x-1首先用x表示a,a=1-x除以x+1再把a的表达式带入用a表示的y的等式中则可得到y=1+5x除以5x-1.

已知x1、x2是方程2x^2-3x-1=0的两个实数根,则由韦达定理可得：x1+x2=3/2,x1*x2=-1/2那么：x1²+x2²=(x1+x2)²-2x1*x2=9

3/4x58+58除以4-64x1/4＝3/4x58+58×1/4－16＝58×（3/4＋1/4）－16＝58－16＝42

因为x1、x2是方程2X^2-2x+3m-1=0的根所以x1+x2=-(-2/2)=1x1*x2=(3m-1)/2又x1*x2/(x1+x2-4)

y²/4+x²=1【是椭圆!】直线PA₁：(y-2)/x=(y₁-2)/x₁直线PA₂：(y+2)/x=(y₁+2)/(

1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷(6÷7)=1÷2×3÷3×4÷4×5÷5×6÷6×7=1÷2×7=0.5×7=3.5明白请采纳,有新问题请求助,

-0.2X/2=Y/3=Z/-7X/2=Y/33X=2YX=2/3YY/3=Z/-7-7Y=3ZZ=-7/3YX+Y+Z=(2/3Y+Y-7/3Y)/(Y+7/3Y)=(-2/3Y)/(10/3Y)=

因为X/3=Y/4=M/5,则令X/3=Y/4=M/5=h可得：X=3h,Y=4h,mM=5h,又因为x+y+m=6则带入得：3h+4h+5h=12h=6h=1/2所以X=3h=3/2,Y=2,M=5

令x除以2=y除以3=z除以4=k则x=2k,y=3k,z=4kx+y+z除以x-2y+3z=(2k+3k+4k)除以(2k-6k+12k)=9k除以8k=8分之9

(3x-4y)÷(2x+y)=1/2所以2x+y=2(3x-4y)=6x-8y4x=9y所以x/y=9/4

(5x+xy-5y)/(x-xy-y)=(5/y+1-5/x)/(1/y-1-1/x)=(1-3)/(-1-3)=1/2

1/(2/3)/(3/4)/.=1/2*3/3*4/4*5/.两两约分最后只剩下1/2*2003=2003/2

x1+x2=4x1x2=-1(x1+x2)^2/(1/x1+1/x2)=(x1+x2)^2*x1x2/(x1+x2)=x1x2*(x1+x2)=-4

绝对值项恒非负,两绝对值项之和=0,两绝对值项分别=03x-y=0(1)x+y=0(2)(1)+(2)4x=0x=0,代入(2)y=-x=0(x-y)/(xy)无意义,因此题目错了.

共有5种算法：1/(2/3)/4/(5/6/7/8)/9=2.81/(2/(3/4))/(5/6/7/8)/9=2.81/(2/(3/4/5)/6/7/(8/9))=2.81/(2/(3/4/(5/6