Question

1.reduceti termenii asemenea: a)4x+2x-3x=
b) 15a-a-5a=
c) 9z+11z-8z+z
d) 10m+3m-9m=
2.a) 2.5x+0.5x-1.5x+3.5x-1.2x=
b) 3.75b-1.25b+(b-0.3b)-(0.7b+0.3b)=
c) 2.9y+(1.25y+5.75y)+0.1y=
d) 2.7a-(3.8a-0.3a+0.5a)+1.3a=

Answer 1

$1a).4x+2x-3x=6x-3x=3x \\ b).15a-a-5a=14a-5a=9a \\ c).9z+11z-8z+z=20z-8z+z=12z+z=13z \\ d).10m+3m-9m=13m-9m=4m$
$2a).2,5x+0,5x-1,5x+3,5x-1,2x=3x-1,5x+3,5x-1,2x= \\ =1,5x+3,5x-1,2x=5x-1,2x=3,8x \\ b).3,75b-1,25b+(b-0,3b)-(0,7b+0,3b)= \\ =3,75b-1,25b+0,7b-b=2,5b+0,7b-b=3,2b-b=2,2b \\ c).2,9y+(1,25y+5,75y)+0,1y=2,9y+7y+0,1y= \\ =9,9y+0,1y=10y \\ d).2,7a-(3,8a-0,3a+0,5a)+1,3a= \\ =2,7a-(3,5a+0,5a)+1,3a=2,7a-4a+1,3a=-1,3a+1,3a=0$