oblicz wartość wyrażenia ; a) x+3+xy dla x=2 y=-1 b)-2x + 3xy dla x=-2 y=-1 pilne na dziś !
a) 2+3+2*(-1)=5+2(-1)=5+(-2)=5-2=3
b) -2*(-2)+3*(-2)*(-1)= -(-2*2)+3(-2)(-1)= -(-4)+3(-2)(-1)=4+3(-2)(-1)=4+(-3*2)(-1)=
=4+(-6)(-1)=4+(-6(-1))=4+(-(-6))=4+6=10
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a) 2+3+2*(-1)=5+2(-1)=5+(-2)=5-2=3
b) -2*(-2)+3*(-2)*(-1)= -(-2*2)+3(-2)(-1)= -(-4)+3(-2)(-1)=4+3(-2)(-1)=4+(-3*2)(-1)=
=4+(-6)(-1)=4+(-6(-1))=4+(-(-6))=4+6=10