bài 3:
a) y+ 3 1/2= 4 2/3 b) 1/y -1/4 =1/12 c) y x 3 2/5= 3 9/10
=> y= 4 2/3 - 3 1/2 => 1/y= 1/12+1/4 => y = 3 9/10 : 3 2/5
=> y= 14/3 -7/2 => 1/y= 1/12 + 3/12 => y= 39/10 : 17/5
=> y= 28/6 -21/6 => 1/y = 1/3 => y= 39/10 x 5/17
=> y= 7/6 => y= 1 : 1/3 => y= 39/34
=> y= 1 x 3
=> y=3
2)
a) = 6/5 x 7/6 x 8/7 x...x 2022/2021
= 6 x 7 x 8 x ...x 2022/ 5 x 6 x 7x ...x2021
= 2022/5
b)= ( 2/2 -1/2) x ( 3/3-1/3) x...x(10/10 - 1/10)
= 1/2 x 2/3 x ...x 9/10
= 1 x 2 x ... x 9 / 2 x 3 x ...x 10
= 1/10
sri e hqua chị quên mất