1) 300-17=283
283*283= 80089
80089*4=320356
108/3=36
36*36=1296
320356+1296=321652
-19,23-15,88=-35,11
-35,11-(-21,34)=-35,11+21,34=-13,23
-13,23+(-11,08)= -24,31
60у-3у=15390
57у=15390
у=15390:57
у=270
<span>(4 - х) + 1 1/5 = 3 7/60
4 - х + 1 12/60 = 3 7/60
- х = 3 7/60 - 4 - 1 12/60
- х = 3 7/60 - 5 12/60
- х = - 2 5/60
х = 2 1/12</span>