Zad 1/151 strona Matematyka z Plusem 1 gimnazjum ALGEBRA a) 2a + (3a - 7) b) x - (2x - 3) c) 3x - (y - 2x) d) -(3a + 6) - 4
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a) 2a+(3a-7)=2a+3a-7=5a-7
b) x-(2x-3)=x-2x+3=-x+3
c) 3x-(y-2x)=3x-y+2x=5x-y
d) -(3a+6)-4=-3a-6-4=-3a-10