Ta có:\(\frac{1}{2x}+\frac{2}{3\left(x-1\right)}=\frac{1}{3}\)
\(\frac{3\left(x-1\right)}{6x\left(x-1\right)}+\frac{4x}{6x\left(x-1\right)}=\frac{1}{3}\)
\(\frac{3x-3+4x}{6x\left(x-1\right)}=\frac{1}{3}\)
\(\frac{7x-3}{6x\left(x-1\right)}=\frac{1}{3}\)
\(\Rightarrow21x-9=6x^2-6x\)
\(\Rightarrow21x-9-6x^2+6x=0\)
\(\Rightarrow-6x^2+27x-9=0\)
Đến đây mk gợi ý thôi nha
choo bieu thuc
A=2x+1/x-3
a, tinh gia tri cua A khi x2=4
b, tim x de A=1/3
c, tim x thuoc z de A co gia tri nguyen
tim cac dang cua x sao cho
bieu thuc A = 2x-1 co gia tri duong x
bieu thuc B = 8-2x co gia tri am
bieu thuc C=2(x+3) khong am
bieu thuc D=7(2-x)khong duong
tinh gia tri cua bieu thuc; P=x^3+x^2*y-2x^2-y(x+y)+3y+x+2018với x+y=2
TINH GIA TRI BIEU THUC ko tim n tinh bieu thuc
125.(-61):(-2)^3:(-1)^2n (nTHUOC N*)
1 tinh gia tri bieu thuc
Cau 3 : - ( x - 1 ) . ( x + 2 ) tại x = 3
Cau 4 : ( 4x - 5 ) . ( x - 7 ) tại x = 4
tinh gia tri bieu thuc
A=1+1/2(1+2)+1/3(1+2+3)+....+1/2015(1+2+3+...+2015)
tinh gia tri bieu thuc: B=1*2*3+2*3*4+3*4*5+...+17*18*19
tinh gia tri bieu thuc sau : A=1+2+3+...+2015
tinh gia tri bieu thuc :1 + 2-3 - 4 + 5 + 6 - .......-303 +304 +305