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1.Zapisz w najprostszej postaciwyrażenia:
a)(0.04x-1.4)+(-0.3x+0.4)=
b)x+[2x-(3/4a+1)]=
c)a-[b-(a+b)]=
d)3x-[-2x+1-(4x+5)-4]=
e)1.14x-(0.8y-0.2x)-1.2y=
f)3.21-4.7x-(2.3-4.07x)-4.08=
g)(-9mn+3m-1)-(-8mn+3m-7n+1)-7n=
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a) (0,04x-1,4)+(-0,3+0,4)= -0,012x² + 0,016x + 0,42x - 0,56= -0,012x² + 0,436x - 0,56
b) x+[2x-(0,3/4a+1)]= x+(2x-3/4a-1)= 2x² - 3/4ax - x
c)a-[b-(a+b)]=a-(b-a-b)=a-b+a+b=2a
d)3x-[-2x+1-(4x+5)-4]=3x-(-2x+1-4x-5-4)=3x+2x-1+4x+5+4= 9x+8
e)1.14x-(0.8y-0.2x)-1.2y= 1,14x-0,8y+0,2x-1,2y= 1,34x-2y
f)3.21-4.7x-(2.3-4.07x)-4.08= 3,21-4,7x-2,3+4,07x-4,08= -3,17-0,63x
g)(-9mn+3m-1)-(-8mn+3m-7n+1)-7n= -9mn+3m-1+8mn-3m+7m-1-7n= -mn-2