Oblicz wartość wyrażenia a) 3x-5y-8x x=5, y=-2 b)6a-4b-15a a=-4, b=-1 2. Zredukuj wyrazy podobne a) 3(2x-4y) +6 (2x+3y) b) 5(3a+4b) -2 (2a+5b) c)7(x-3y) +3 (3x+4y)
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1. a) x=5, y=-2
3x-5y-8x = -5x - 5y = -5(x + y)
wstawiając x=5, y=-2:
-5(x + y)= -5(5 - 2) = -5 * 3 = -15
b)a=-4, b=-12
6a-4b-15a = -9a - 4b
wstawiając a=-4, b=-12
-9a - 4b = -9 * (-4) - 4 * (-12) = 36 + 48 = 84
2. a) 3(2x-4y) +6 (2x+3y) = 6x - 12y + 12x + 18y = 18x + 6y = 6(3x - y)
b) 5(3a+4b) -2 (2a+5b) = 15a + 20b - 4a - 10b = 11a - 10b
c)7(x-3y) +3 (3x+4y) = 7x - 21y + 9x + 12y = 16x - 9y
a) 3x-5y-8x=3x5-5x(-2)-8x5=15+10-40=-5
b) 6a-4b-15a=6x(-4)-4x(-1)-15x(-4)=-24+4+60=40
a) 3(2x-4y)+6(2x+3Y)=6x-12y+12x+18y=18x+6y
b) 5(3a+4b)-2(2a+5b)=15a+20b-4a-10b=11a+10b
c)7(x-3y)+3(3x+4y)=7x-21y+9x+12y=16x-9y