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b) 4a +1
c)3x +2
d)6a-b
e)5a+3-x+b
f)3k-m+2n+2
g)0,4 x-0,7y-6,9
h)2,5a+4+0,2b
i)1/4-1/4x
j)-1/9x+7/9y-2/7
b. ) 5a - ( a + 1 )=5a-a-1=4a-1
c.)2x - ( 3-5-x )=2x-3+5+x=3x+2
d. ) 2a + ( 3a -2b ) + ( a+ b ) =2a+3a-2b+a+b=6a-b
e. ) 5a - ( 2 - x ) + b - 2x + 5=5a-2+x+b-2x+5=5a+3+b-x
f.) 7k - ( m - 2n + k ) - ( 5k - 3 ) + ( 2k - 1 )=7k-m+2n-k-5k+3+2k-1=3k-m+2n+2
g. ) 0,3 x - ( 5 + 0,7 y ) - ( 0,9 - 0,1 x ) + ( 2k - 1 ) =0,3x-5-0,7y-0,9+0,1x+2k-1=0,4x-5,9-0,7y
h.) 0, 5a + ( 5 - 0,8 b + 2a ) - ( - b +1 )=0,5a+5-0,8b+2a+b-1=2,5a+0,2b+4
i. ) 3/4 - ( 1/4 x + 1/2 )=3/4-1/4x+1/2=4,6-1/4x
j. ) 1/3 x + 1/9 y + ( 2/3 y - 4/9 x - 2/ 7 ) = 1/3 x + 1/9 y +2/3y-4/9x-2/7=3/6x+4/2y-4