1. FISA DE LUCRU
ADUNAREA SI SCADEREA NUMERELOR REALE REPREZENTATE
PRIN LITERE
CLASA A VII-A
I.Efectuati:
a) x+x+x=
b) 2x+3x=
c) 7y+3y-4y=
d) 7a-5a=
e) x+2x-3x=
f)x2
+3x2
-2x2
=
g) 7a+11a-13a-5a+16a-19a=
h)2x-7x+11x-5x-4x=
i)15ab-5ab+4ab-13ab+6ab=
j) -7xy-(-13+10)xy+(-20+27)xy-7xy=
II. Calculati:
a) a+2+a-2=
b) 2x+x2
-2x=
c)2y2
-3y+y2
+3y=
d)2a-(a-3b)=
e) (x+y)-(2x-y)=
f) –(5a-2b)-(-5a+b)=
g) x3
-3x2
+2x3
+4x+4x2
-3x=
h) 2a+3b+4c-4a+8b-4c=
i) 12x+(-5x+9y)- 4x=
III. Desfaceti parantezele si reduceti termenii asemenea:
a) 2(3a+9b-7c)-3(4a+5b+9c)=
b) 4(2x2
-3x+4)-3(3x2
-4x-2)=
c) 8x2
-3(2x2
-x-7)+2(x-5x2
+8) – 8x2
=
d) 3(2x2
-3y2
)-4(3x2
+4y2
)=
e) 4(9x-2)+3(7x+5)-6(x-3)=
f) 2(3x-5y)+3(x+y)-x-y=
g) x( ) =+−++− xxx 2434)2332(23
h) a (2 =+−− )2534()233 a
i) =−++ )3250()818( xyxy