Odpowiedź:
a) (a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b= -2a+4b
b) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
c) (2ab+a+3)-(3ab-a+3)=2ab+a+3-3ab+a-3= -ab+2a
a) 3-7×(-2)=3-(-14)=3+14=17
b) 4×(-3)²-4(3×(-3)+8)=36+4=40
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Odpowiedź:
a) (a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b= -2a+4b
b) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
c) (2ab+a+3)-(3ab-a+3)=2ab+a+3-3ab+a-3= -ab+2a
a) 3-7×(-2)=3-(-14)=3+14=17
b) 4×(-3)²-4(3×(-3)+8)=36+4=40