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  • Usuário do Brainly
2014-08-23T17:30:45-03:00
A) -5+3=-(5-3)=\boxed{-2}

b) 7-8+2=-(8-7-2)=-(-1)=\boxed{1}

c) 4-5=-(5-4)=\boxed{-1}

d) (-4)\cdot(-7)=+(4\times7)=\boxed{28}

e) (7)\cdot(-5)=-(7\times5)=\boxed{-35}

f) (-6)\cdot(-8)=+(6\times8)=\boxed{48}

g) (+8)\cdot(+9)=8\times9=\boxed{72}

h) 4-(+3)-(-1)+5=4-3+1+5=1+6=\boxed{7}

i) 3+(+5)-(-7)-3=3+5+7-3=8+4=\boxed{12}

j) 7+4+(-7)-2=7+4-7-2=11-9=\boxed{2}
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