1) Упростим дробь:5x - 2x - 51
6
3x - 51--------- = ----------6
3x - 51 = 63x = 57x = 19
Ответ: x = 19
2) Упростим дроби:3x + 4-------- + --------5 2x - 7--------- = ----------2(2x + 3) 5
3x + 4 2x - 14-------- + --------- = ----------5 2 5
3x(2) - 14(5) + 4(2x + 3)(5)-------------------- = 5x - 1010
6x - 70 + 4(2x + 15) = 506x - 70 + 8x + 20 = 5014x - 50 = 5014x = 100x = 7.14
Ответ: x = 7.14
3) Упростим дроби:7x - 3 9 - 4x 7 - x--------- - --------- = ---------9 - 4x 3 2
7x - 3(3) - (9 - 4x)(2) = 7(9 - 4x)--------- - ------- = ---------9 - 4x 3 2
7x - 9 - 18 + 8x = 63 - 28x15x - 27 = 63 - 28x15x + 28x = 9043x = 90x ≈ 2.09
Ответ: x ≈ 2.09
1) Упростим дробь:
5x - 2x - 51
6
3x - 51
--------- = ----------
6
3x - 51 = 6
3x = 57
x = 19
Ответ: x = 19
2) Упростим дроби:
3x + 4
-------- + --------
5 2
x - 7
--------- = ----------
2(2x + 3) 5
3x + 4 2x - 14
-------- + --------- = ----------
5 2 5
3x(2) - 14(5) + 4(2x + 3)(5)
-------------------- = 5x - 10
10
6x - 70 + 4(2x + 15) = 50
6x - 70 + 8x + 20 = 50
14x - 50 = 50
14x = 100
x = 7.14
Ответ: x = 7.14
3) Упростим дроби:
7x - 3 9 - 4x 7 - x
--------- - --------- = ---------
9 - 4x 3 2
7x - 3(3) - (9 - 4x)(2) = 7(9 - 4x)
--------- - ------- = ---------
9 - 4x 3 2
7x - 9 - 18 + 8x = 63 - 28x
15x - 27 = 63 - 28x
15x + 28x = 90
43x = 90
x ≈ 2.09
Ответ: x ≈ 2.09