Bài 456 Tìm x, biết: 1. 3và2/3vàx + 5và1/2 = 11và1/6
2. 2và3/5vàx – 1/7 = 1 9/35
3. ( 3 4/5 x + 40) : 38/5 = -50
4. (5 1/2 – 2x) . 3/22 = -1 1/2
1) 32323x+ 51212 = 111616
⇔ 33232x = 173173
⇔ x = 17111711
2) 23535x – 1717 = 19351935
⇔ 23535x = 24352435
⇔ x = 24912491
3) (34545x + 40) : 385385 = -50
⇔ (34545x + 40 = -380
⇔ 34545x = -420
⇔ x = –210019210019
4) (51212 – 2x) . 322322 = -11212
⇔ 51212 – 2x = -11
⇔ 2x = 332332
⇔ x = 334