Investigacion

11.-(17xz-12+15uz)+(12xz+12+15uz)=(17xz+12xz)+(-12+12)+(15uz+15uz)=(29xz)+(30uz)= 29xz+30uz12.-(2.3x2-5y2)+(1.3x2+2.3y2)=(2.3x2+1.3x2)+(-5y2+2.3y2)=3.6x2 -2.7y2
13,-(7ax+4b-y)+(10ax-56y)=(7ax+10ax)+(4b)+(-y-56y)=17ax+4b-57y
14.[17ab-(9ab+8)]+(16ab-2)=(17ab-9ab-8)+(16ab-2)=(17ab+16ab-9ab)+(-8-2)=
24ab-10
15.15ab-[(6ab-c)+(4ab+c)]= 15ab-[(6ab+4ab)+(-c + c)]=15ab-(10ab)=15ab-10ab= 5ab
16.a-b2-[a2-(2ab-b2)]- [a2-(2ab-b2)]=a-b2-(a2-2ab+b2)-(a2-2ab+b2)=a-b2-a2+2ab-b2-a2+2ab-b2=2a2+a+4ab-3b2
17.(9a-7-48b)-(4a+4-20b)=(9a-4a)-(-7+4)-(-48b-20b)=5a+3+28b=5a+28b+318.(2a2+5b2)-(12a2+4b2)=(2a2-12a2)-(5b2+4b2)=10a2-9b2
19.(15x-436)-(8x+21)=(15x-8x)-(436-21)=7x-415
20.(9ab+4)-(3ab+4)=(9ab-3ab)-(4+4)=6ab-821.(8ab+4b)-(5ab-4b)=8ab-5ab)-(4b-4b)=3ab
22.(7.3x+4.2y)-(5.3x+2.2y)=(7.3x-5.3x)-(4.2y+2.2y)=2x+2y
23.(3.5x+4.5y)-(5.3x+4.2y)=(3.5x-5.3x)-(4.5y+4.2y)=-1.8x-0.3y24.(15xy+6z)-(5xy+9z)=(15xy-5xy)-(6z+9z)=10xy-15z
25.(15xy-7z)-(xy+15z)=(15xy-xy)-(-7z+15z)=14xy-8z
26.(20x-8-8y)-(13x-4-9y)=(20x-13x)-(-8-4)-(8y-9y)=7x+12+17y=7x+17y+1227.(17xz-12+15zu)-(12xz+12+15zu)=(17xz-12xz)-(12+12)-(15zu+15zu)=5xz
28.(2.3x2-5y2)-(1.3x2+2.3y2)=(2.3x2-1.3x2)-(5y2+2.3y2)=x2-2.7y229.(7ax+4b-y)-(10ax-56y)=(7ax-10ax)-(4b)-(-y-56y)=-3ax-4b+57y
30. [17ab-(9ab+8)]-(16ab-2) = (17ab-9ab-8)-(16ab-2)=(17ab-9ab-16ab)-(-8-2)=-8ab+10
31.15ab +[(6ab-c)-(4ab+c)] =15ab+ (6ab-4ab)-(-c+ c) =(15ab+6ab-4ab)=17ab
32. a-b2+ [a2-(2ab-b2)] + [a2-(2ab-b2)] =a-b2+ (a2-2ab+b2) + (a2-2ab+b2) =2a2+a-4ab+b2