Question

.exercitiile 5 si opt60 de puncte plus coroanaaaa!!!!!!!!!!

Answer 1

ex 5.a) 0,5x+0,7x-0,6x+3,5x-1,8x= 1,2x-0,6x +3,5x-1,8x= 0,6 x+3,5x-1,8x=
4,1x-1,8x=2,3x
   b) 2,25a-1,65a+(3a-a)-(a-0,7a)=0,6a+2a-0,3a=2,6a-0,3a=2,3a
   c)(16a+12a+5a)-(31a-22a)=33a-9a=24a
   d) 0,3b-(1,5b-0,7 b+0,2 b)+2b=0,3b-(0,8 b+0,2b)+2b= 0,3b-1b+2b=1,6b
ex 8.
a) x²y+5xy²-3x²y+6xy²-2xy²+3x²y= x²y+9xy²=xy(x+9y)
b) 5a²+3ab +b²-2ab-a²-3b²+4ab+(a+b)(a-b)=  4a²+5ab -2b²+a²-b²
c)6m+3n-2n-3m-5-3m+4n+6=5n+1+6m-6m= 5n+1
d)13m²+2mn-n²-2m²-3mn-4n²-10m²-2mn=3m²-5n²-3mn

Answer 2

5) a)=1,2x-0,6x+1,7x=2,3x
b)=2,25a-1,65a+2a-a+0,7a=0,6a+1,7a=2,3a
c)=3,9y+6y+0,1y=4y+6y=10y
d)=0,3b-1b+2b=0,3b+1b=1,3b