1) x=3,15 x=-3,15
2) 5,1-7,3=-2,2
3) -3,2*2=-6,4
4) 24 : (-10) = -2,4
Х+398=517+57
Х+398=574
Х=574-398
Х=176
338:100*13=43,94
ответ: 43,94
42:7=6
28+6=34
34-6=28
__________
72:9=8
96-8=88
88+15=103
__________
7х8=56
100-56=44
_________
8х8=64
90-64=26
__________
9х8=72
80-72=8
_________
74:9=8(ост.2)
65:9=7(ост.2)
85:9=9(ост.4)