Номер 1
а) 8.3*2.6=21.58
б) 2.37*52.1=123.477
в) 78.23*0.01=0.7823
г) 3.9/1.3=3
д) 7.106/3.4=2.09
е) 78.23/0.01=7.823
номер 2
(16.023* 5.4 - 15.022* 5.4)/ 2.7
1)16.023* 5.4=86.5242
2)15.022* 5.4=81.1188
3)86.5242-81.1188=5.4054
4) 5.4054/2.7=2.002=2
номер 3
3.7*(17.4-4х)=18.5
64.38-14.8х=18.5
-14.8х=18.5-64.38
-14.8х=-45.88
х=3.1
5 не знаю