a)2xy-8x+6xy-2x+10y= 8xy-10x+10y b) (3a+5b-9)-(3a-5b+6)= 3a+5b-9-3a+5b-6=10b-15 c)3(2x-5)-2(3x+4)=6x-15-6x+8=-7 ----- dla x=2 3(x ²-2x+3)-2(x ²-5x-1)= 3(2²×2+3)-2(2²-5×2-1)=3(4×2+3)-2(4-10-1)=3×11-2×(-7)=33-(-14)= 33+14=47 pozdrawiam ;)
a) 8xy-10x+10y b)3a+5b+9+3a+5b-6= 6a+10b+3 c)6x-15-6x-8= -23 3(2²-2*2+3)-2 (2²-5*2-1)= 3(4-4+3)-2(4-10-1)=12-12+9-8+20+2=23
a)2xy-8x+6xy-2x+10y= 8xy-10x+10y b) (3a+5b-9)-(3a-5b+6)= 3a+5b-9-3a+5b-6= 10b-6 c)3(2x-5)-2(3x+4)= zmienisz znak na przeciwny bo masz minus przed nawiasem !!! 6x-15-6x-8= -23 ----- dla x=2 3(x ²-2x+3)-2(x ²-5x-1)= 3x²-6x+9-2x²+10x+2= x²+4x+11 x²+4x+11=2²+4*2+11=4+8+11=23
