Đáp án: `x=20` Giải thích các bước giải: `(3/4x-10,5):3=1(7)/(8).80%` `\to (3/4x-105/10):3=15/(8).(80)/100` `\to (3/4x-21/2):3=15/8.(4)/5` `\to (3/4x-21/2):3=60/40` `\to (3/4x-21/2):3=3/2` `\to 3/4x-21/2=3/2×3` `\to 3/4x-21/2=9/2` `\to 3/4x=9/2+21/2` `\to 3/4x=(21+9)/2` `\to 3/4x=30/2` `\to 3/4x=15` `\to x=15:3/4` `\to x=15.(4)/3` `\to x=5.4` `\to x=20` Vậy `x=20` Reply
Đáp án: `x=20` Giải thích các bước giải: `b)` `(3/4x-10,5)÷3=1(7)/8×80%` `=>(3/4x-21/2)÷3=15/8×4/5` `=>(3/4x-21/2)÷3=3/2` `=>3/4x-21/2=3/2×3` `=>3/4x-21/2=9/2` `=>3/4x=9/2+21/2` `=>3/4x=15` `=>x=15÷3/4` `=>x=20` Reply
Đáp án:
`x=20`
Giải thích các bước giải:
`(3/4x-10,5):3=1(7)/(8).80%`
`\to (3/4x-105/10):3=15/(8).(80)/100`
`\to (3/4x-21/2):3=15/8.(4)/5`
`\to (3/4x-21/2):3=60/40`
`\to (3/4x-21/2):3=3/2`
`\to 3/4x-21/2=3/2×3`
`\to 3/4x-21/2=9/2`
`\to 3/4x=9/2+21/2`
`\to 3/4x=(21+9)/2`
`\to 3/4x=30/2`
`\to 3/4x=15`
`\to x=15:3/4`
`\to x=15.(4)/3`
`\to x=5.4`
`\to x=20`
Vậy `x=20`
Đáp án:
`x=20`
Giải thích các bước giải:
`b)` `(3/4x-10,5)÷3=1(7)/8×80%`
`=>(3/4x-21/2)÷3=15/8×4/5`
`=>(3/4x-21/2)÷3=3/2`
`=>3/4x-21/2=3/2×3`
`=>3/4x-21/2=9/2`
`=>3/4x=9/2+21/2`
`=>3/4x=15`
`=>x=15÷3/4`
`=>x=20`