Question

Scrieți cât mai simplu:a)-7x+8x-12;b) 3a-8a +10 ;c)12xy+3xy-19 xy;d)11xla 2-5 xla 2+23 x la 2;e)2 supra 3 x la 2 +1 supra2 xla2 ;f)-1 supra 3 x+5 supra6 x+2x7supra2 x;g)0,(3) a 2 b-5 supra6 ex primul de sus dau coroană!urgent!

Answer 1

a)-7x+8x-12=x-12

b) 3a-8a +10=10-5a=5(2-a) 

c)12xy+3xy-19xy=-4xy

d)11x²-5 x²+23 x²=29x²

e)2 / 3 x² +1 /2 x²-x²=4x²/6+3x²/6-6x²/6=x²/6

 f)-1/3 x+5 /6 x+2x-7/2 x=-2x/6+5x/6+12x/6-21x/6=-6x/6=-x

g)0,(3) a²b-4/3a²b-5/6a²b=3/9a²b-4/3a²b-5/9a²b=1/3a²b-4/3a²b-5/6a²b=-a²b-5/6a²b=-11a²b/6

h)2√2xyz-√8xyz+√18xyz=xyz(2√2-2√2+3√2)=3√2xyz

i)1/6ax²-0,75ax²-0,5ax²+ax²=ax²(1/6-0,75-0,5+1)=-0,08(3)ax²


j)1/2xy+2/4xy-5/4xy=xy(1/2+2/4+5/4)=xy(1+5/4)=xy(4/4+5/4)=9/4xy