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yx1/2+y-yx7/2=21-yx1/4 =>yx1/2+y-yx7/2+yx1/4=21
=>y x (1/2+1-7/2+1/4)=21 => y x (-7/4)=21 =>y=21:(-7/4)=21 x (4/-7)=-12
muốn tìm y ta lấy nhân chéo chia đối
ta đổi 24/48 = 1/2 sau đó ta 1 x 5 : 2 = 2,5 nhé
65/91= y- 5/133
nhân chéo =>65.133=91.(y-5)
=>8645 = 91.(y-5)
=>y-5 = 8645:91
=> y- 5 = 95 => y= 95 +5 = 100
\(\frac{65}{91}=x-\frac{5}{133}\)
\(x=\frac{65}{91}+\frac{5}{133}\)
\(x=\frac{100}{133}\)
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a } 4 / 5 x 3 /y x 2 / 11 = 24 / 165
= 4/5 x 2/11 x 3/y =24/125
=8/55 x 3/y=24/125
= 24/125:8/55
=33/25
( y+3)+(y+5)=84
y+3+y+5 = 84
(y+y)+3+5=84
2y + 8 = 84
2y = 84 - 8
2y = 76
y = 76 : 2
y = 38
vậy____
cau 1 y=38
cau 2 y=rong