Odpowiedzi

2010-03-15T18:50:19+01:00
1
( 7*½ - 7*(-½) ) - ( 3*½ - 3*(-½) ) =(3,5+3,5)-(1,5+1,5)=4
2
2 (3 - (-2)) - 3 (3 - 3(-2) ) =10-27=-17
3
-5*(-1½)² - 5 ( 3*(-1½)² - 4*(-1½)) + 2*(-1½) = 1,5

2010-03-15T18:54:08+01:00
( 7*½ - 7*(-½) ) - ( 3*½ - 3*(-½) ) =(7/2+7/2)-(3/2+3/2)= 14/2-6/2=8/2=4

(3 - (-2)) - 3 (3 - 3*(-2) ) =
=(3+2)-3(3+6)=
=5-27=-22


-5x² - 5 ( 3x² - 4x) + 2x =
=-5*9/4-5(3*9/4+6-3)=
=-45-5(27/4+3)=
w ostatecznym rachunku wyszło -93,75