tim y thoa man 7/y=4/5
Những câu hỏi liên quan
tim cac so m,n,p thoa man : m+n+p+8=2canm-1 + 4cann-2 +6canp-3
tim cac so x,y,z thoa man :canx+cany-1 +canz-2 = 1/2(x+y+z)
tim cac so x,y,z thoa man :x+y+z+4=2canx-2 +4cany-3+6canz-5
tim x;y;z thoa man :5x-3y/4=2z-3x/5=9y-10z/7;2y-z=132
tim x;y;z thoa man :x+3y/19=3y+9z/114=5z+15x;x+y+2z=-31
tim x;y nguyen thoa man
3x+7=y(x-3
\(3x+7=y\left(x-3\right)\)
\(\Rightarrow3x+7=xy-3y\)
\(3x-xy+3y=-7\)
\(x\left(3-y\right)+3y=-7\)
\(\Rightarrow-x.\left(y-3\right)+3y=-7\)
\(-x\left(y-3\right)+3y-9=-7-9=-16\)
\(-x\left(y-3\right)+3\left(y-3\right)=-16\)
\(\left(3-x\right)\left(y-3\right)=-16\)
\(\Rightarrow3-x;y-3\inƯ\left(-16\right)=\left\{-16;-8;-4;-2;-1;1;2;4;8;16\right\}\)
| 3-x | -16 | -8 | -4 | -2 | -1 | 1 | 2 | 4 | 8 | 16 |
| x | 19 | 11 | 7 | 5 | 4 | 2 | 1 | -1 | -5 | -13 |
| y-3 | 1 | 2 | 4 | 8 | 16 | -16 | -8 | -4 | -2 | -1 |
| y | 4 | 5 | 7 | 11 | 19 | -13 | -5 | -1 | 1 | 2 |
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Tim x biet:
(2x-1)5=(2x-1)7
Tim cac so nguyen to x , y thoa man:
(x-2)2.(y-3)2=4
trinh bay cach lam nhe
(2x-1)5=(2x-1)7
=>x=0;1;\(\frac{1}{2}\)
(x-2)2.(y-3)2=4
phân tích rồi kẻ bảng ra
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Tim x, y nguyên thoa man
(x-2) y=5
Tim x,y nguyen thoa man:
X^4 + y + 4 = y^2 - x^2
tim so cap gia tri x , y nguyen thoa man |x|+|y|=4
tim cap so nguyen x,y thoa man: |x+4|+|y-2|=3
tim cac so tu nhien x, y thoa man 2xy + x + y = 4
X=1
Y=1
Nên 2.1.1+1+1=4
mình làm trước nha
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