Đáp án:
Giải thích các bước giải:
2.
` x + 2/3 = -1/4 `
` x = -1/4 - 2/3 `
` x = -11/12 `
vậy ` x = -11/12 `
` [ x - 1/2 ] - 3/4 = 1/4 `
` x - 1/2 = 1 `
` x = 1+1/2 `
` x = 3/2 `
vậy ` x = 3/2 `
b) ` 50% .x -x^2 = 0 `
` 1/2 .x-x^2 = 0 `
` x/2 - 2x^2 = 0 `
` 1-2 x = 0 `
` x = 1/2 `
1.
` 75% - 1 1/2 + 0,5 : 5/12 `
` = 3/4 - 3/2 + 1/2 . 12/5 `
` = 3/4 - 3/2 + 6/5 `
` = 9/20 `
` -4/7 . 2/3 + -4/7 . 1/3 + 2 4/7 `
` = -4/7 . 2/3 + (-4)/7 . 1/3 + 18/7 `
` = -4/7 . ( 2.3 + 1/3 ) + 18/7 `
` = -4/7 . 1 + 18/7 `
` = 2 `