1. Амалдарды орындаңдар. 1) 2,8·(−3,9)−76,15:15,23; 2) 34,68:(7,11+1,56)+46:(2,45−1,65); 3) (0,62+0,56−2,29)·(8,14−5,34); 4) 62,93+(12,5−7,6+3,21):0,1.

1. \(2.8\cdot(-3.9)-76.15:15.23=-10.92-5=-15.92\).
2. \(34.68:(7.11+1.56)+46:(2.45-1.65)=34.68:8.67+46:0.8=4+57.5=61.5\).
3. \((0.62+0.56-2.29)\cdot(8.14-5.34)=(-1.11)\cdot2.8=-3.108\).
4. \(62.93+(12.5-7.6+3.21):0.1=62.93+8.11:0.1=62.93+81.1=144.03\).

Жауабы: 1) −15,92; 2) 61,5; 3) −3,108; 4) 144,03.