Zadanie 19/165 Zapisz w jak najprostrzej postaci : a)(a+b)-(2a-b)-(a-2b) b)(3x-y+1)-(x+y)+(y-x) c) -(kx+ny)-(3kx+2ny)+(5kx-3ny) d)(2ab+a+3)-(3ab-a+3) Matematyka z plusem Prosze,abyscie mi wszystko dokladnie rozpisali!!:) DAje naaaj!! ;-*
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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) -(kx+ny)-(3kx+2ny)+(5kx-3ny)=-kx+ny-3kx-2ny+5kx-3ny=kx-4ny
d)(2ab+a+3)-(3ab-a+3)=2ab+a+3-3ab+a-3=2a-ab