Question

a- 7.(-2)-8(+5)-5.(-2)
b- 15+(-2)-(4)(+5)(-6)-(-7)(-10)
c- 19-{5(-4)-[(-4)+(+5)]}

??

Answer 1

a) 7 (-2)-8 (+5)-5.(-2)
-14-40+10
-54+10
-44

b) 15+(-2)-(4)(+5)(-6)-(-7)(-10)
15-2-4(5)(-6)+7 (-10)
15-2-4-30-70
-117

c) 19-{5 (-4)-[(-4)+(+5)]}
19-{-20-[-4+5)]}
19-{-20-1}
19-{-21}
19+21
40