a= 1x2 /2x2 x 2x3/3x3 x 3x4/4x4 x 4x5 / 5x5 x.........x 2021x2022 / 2022x2022 B = 2022 x 2023 - 2023 x 2021/2023 x 2017 + 2023 x 5

Đáp án`+`Giải thích các bước giải:

`A=(1xx2)/(2xx2)xx(2xx3)/(3xx3)xx(3xx4)/(4xx4)xx...xx(2021xx2022)/(2022xx2022)` $\\$ `A=1/2xx2/3xx3/4xx...xx2021/2022` $\\$ `A=(1xx2xx3xx...xx2021)/(2xx3xxx3xx...xx2022)` $\\$ `A=1/2022` $\\$ $\\$ $\\$ `B``=(2022xx2023 - 2023xx2021)/(2023xx2017 + 2023xx5)` $\\$ `B=(2023(2022-2021))/(2023(2017+5))` $\\$ `B=(1xx2023)/(2023xx2022)` $\\$ `B=1/2022` $\\$ Vậy `A=B=1/2022` $\\$

`color[#ff7774][@Ceridwen]`