1. zapisz wyrażenie w jak najprostszej postaci. a) 5(a+4c)-3(2a-5c) b) 12x(x-2y+2)+5y(-2x-y+10) c) 5km(4-3k-2m)-10 km (2-1,5k-m) d) 11(a²-2a+1)-4(-a²-2a-3)+2(-a²+5a+1) e) 9(2t-3w)-8(4w+5t)+7(4t-w)
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a) 5a+20c-6a+15c=-a+35c
b)12x^2+24xy+24x-10xy-5y^2+50y=12x^2+14xy+24x-5y^2 +50y
d)11a^2-22a+11+4a^2+8a+12-2a^2+10a+2=13a^2-8a+25
e)18t-27w-32w-40t+28t-7w=6t-66w
W c nie wie wiem o co chodzi. Podejrzanie napisałaś przykład :D
a) 5(a+4c)-3(2a-5c)=5a+20c-6a+15c=35c-a
b) 12x(x-2y+2)+5y(-2x-y+10)=12x^2-24xy+24x-10xy-5y^2+50y=12x^2-34xy+24x-5y^2+50y
c) 5km(4-3k-2m)-10 km (2-1,5k-m)=20km-15k^2m-10km^2-20km+15k^2m+10km^2=0
d) 11(a²-2a+1)-4(-a²-2a-3)+2(-a²+5a+1)=11a^2-22a+11+4a^2+8a+12-2a^2+10a+2= 13a^2-4a+25
e) 9(2t-3w)-8(4w+5t)+7(4t-w)=18t-27w-32w-40t+28t-7w=6t-66w=t-11w