216 : (16 - х) = 18 5у + 3(7у + 18) = 106
16 - х = 216 : 18 5у + 21у + 54 = 106
16 - х = 12 26у = 106 - 54
х = 16 - 12 26у = 52
х = 4 у = 52 : 26
у = 2
8х + 4(13х + 32) = 308 5(11х - 31) - 9х = 121
8х + 52х + 128 = 308 55х - 155 - 9х = 121
60х = 308 - 128 46х = 121 + 155
60х = 180 46х = 276
х = 180 : 60 х = 276 : 46
х = 3 х = 6
1)(20 1/2+12 3/5)*1/10 = 3,31
1) 20,5 + 12,6 = 33,1
2) 33,1 • 0,1 = 3,31
2)(8 1/4- 2 5/16)*4/25 = 0,85
1) 8 1/4 - 2 5/16 = 8 4/16 - 2 5/16 = 5 15/16
2) 5 15/16 • 4/25 = 95/16 • 4/25 = 17/4 • 1/5 = 17/20 = 0,85
3)(2/7+5/21):1 4/7 = 1/3
1) 2/7 + 5/21 = 6/21 + 5/21 = 11/21
2) 11/21 : 1 4/7 = 11/21 • 7/11 = 1/3
4)(8/11+3/22):5/11 = 1,9
1) 8/11 + 3/22 = 19/22
2) 19/22 • 11/5 = 1/9
5) 1 7/36:(3/8+5/12) = 1 29/57
1) 3/8 + 5/12 = 9/24 + 10/24 = 19/24
2) 1 7/36 • 24/19 = 43/36 • 24/19 = 43/3 • 2/19 = 86/57 = 1 29/57
6) 17/36:(7/12-5/9) = 17
1) 7/12 - 5/9 = 21/36 - 20/36 = 1/36
2) 17/36 • 36/1 = 17