21/56 = 3/8 = 0,375
144/120 = 12/10 = 1,2
156/128 = 39/32(?)
396/240 = 132/80 = 1,65
(3 3/5 - 2 1/15) * 5= 7 2/3
1) 3 3/5 - 2 1/15 = 18/5 - 31/15 = (18*3 - 31*1)/15 = (54 - 31)/15 = 23/15 = 1 8/15
2) 1 8/15 * 5 = 23/15 * 5 = 23/3 = 7 2/3
<span>(1 14/17-1 1/34)*34= 27
1)1 14/17 - 1 1/34 = 31/17 - 35/34 =(31*2 - 35*1)/34 = (62 - 35)/34 = 27/34
2)27/34 * 34 = 27
8 3/17 * 5 1/4 + 3 14/17 * 5 = 62 3/68
8 3/17 * 5 1/4 + 3 14/17 * 5 = 139/17 * 21/4 + 65/17 * 5 = 2919/68 + 65/17 * 5 = 2919/68 + 325/17 = (2919*1 + 325*4)/68 = (2919 + 1300)/68 = 4219/68 = 62 3/68
</span>
1 сп. Решить поэтапно:
134460 + (х - 1137 ) = 546583
х - 1137 = 546583 - 134460
х - 1137 = 412123
х= 412123 + 1137
х= 413260
2 способ. Раскрыть скобки.
134460 + (х- 1137)= 546583
134460 + х - 1137 = 546583
х +(134460 - 1137) = 546583
х + 133323=546583
х= 546583 - 133323
х=413260
Проверим:
134460 + (413260 - 1137) = 546583
134460 + 412123=546583
546583=546583