October 2020 0 90 Report
Resova as se aeguintes expressoes numericas com numeros inteiros  (-2)x(-3)+(-1+5)=
(-12+10)x(-20+30)=
(+20-5)x(+12-4)-(-1+3)=
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200 - (400-8+150)=80+2-(74+20-40)=(80-40+25)-(100-60+15)=
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