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1+x(x+4)=1+(-11)(-11+4)=1+121-44=78
x-2y=1-2(-1)=1+2=3
2x^-y(x+1)=2*(-2)^-5(-2+1)=8+10-5=13
(m+1)(n-2)=(2+1)(1-2)=3*(-1)=-3