Tim y biet y:6x7.2+1.3xy+y:2+15=19.95
X:6x7.2+1.3xX+X:2+15=19.95
tìm y biết : y : 6 x 7.2 +1.3 x y + y : 2 + 15 = 19.95
tim x,y biet 15^x+8=y^2
tim y biet [2/11*13+2/13*15+2/15*17+2/17*19+2/19*21]*462-y=19
Tim x,y thuoc N biet
(2x-1).(y+2)=15
Tim cac so x,y,z biet x/y=9/7; y/2=7/3 va x-y+z=-15
B1:tim cac so nguyenx,y biet:
X,y + 2.x- 3y= 11
B2 tim x biet
A -15.(x+2)+7.(2x-3)=(-5) . (+10)
Giai gap minh nhe
\(-15.\left(\chi+2\right)+7.\left(2\chi-3\right)=\left(-5\right).10\)
\(\Rightarrow-15\chi+\left(-30\right)+14\chi-21=-50\)
\(\Rightarrow\left(-15\chi+14\chi\right)=-50+30+21\)
\(\Rightarrow\chi=1\)
HTDT
tim x;y;z biet
1/2x=2/3y=3/4z va x-y =15
Tham khảo nha no no no : Câu hỏi của nguyenquocngoc - Toán lớp 7 - Học toán với OnlineMath
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tim x , y tu nhien biet (x^2+1)(2^x+2)(2^x+3)(2^x+4) +15^y=1679