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b. 7x-3 (5x+2)-6(7+2x)= 7x-15x-6-42-12x=-20x-48
-3 (5x-4)+8(-3x+2)=
-15x+12-24x+16=
-39x+28
b)
7x-3 (5x+2)-6(7+2x)=
7x-15x-6-42-12x=
-20x-48
c)
-5 (3y-7)-2(6+4y)+3y=
-15y+35-12-8y+3y=
-20y+23
d) dla a=1/4 czyli jedna czwarta
5a+4(a-1)=
5a+4a-4=
9a-4=
9*¼-4=
2,25-4=
-1,75
e)dla a=1 b=0,2
5a+3(a-2)+5b=
5a+3a-6+5b=
8a-6+5b=
8*1-6+5*0,2=
8-6+1=
3
f)dla b=1/3 czyli jedna trzecia
2b+1/2)-6b=
-4b+½=
-4*⅓+½=
-1⅓+½=
-⅚
g)dla a=-4 b=-2
2a+0,5(a-2)+5b=
2a+0,5a-1+5b=
2,5a-1+5b=
2,5*(-4)-1+5*(-2)=
-10-1-10=
-21
h)
3x-0,2(1-2x)=
3x-0,2+0,4x=
3,4x-0,2
b)...=7x-15x-6-42-12x=-20x-48
c)...= -15y+35+12-8y+3y= -20y+47
d)
5 * 1/4 + 4 *(1/4 - 1)= 5/4+4*(-3/4)=1 i 1/4 -3 = -1 i 3/4
e) ... = 5*1+3(1-2)+5*0,2= 5+3*(-1)+1= 5-3+1=3
f)...=2*1/3 +1/2 -6*1/3 = 2/3+1/2-6/3 = 4/6+3/6-12/6=- 5/6
g).... = 2a + 0,5a - 1+5b = 2,5a + 5b -1
h) podajesz a i b a w zad x???