Rozwiąż i sprawdź równania:
a) 4-3(x-2) = 13
b) -9(2y-7) +4y=5(1-y) -2(1 - 3y)
c) 5(2a - 3) -6(3a-4)= 5a - 4
d) 10z - 3(2z +1) = 0,6 e) 2w - 2/5( 1 i 1/5 w +1) = 0,72w
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a ) 4-3(x-2)= 13
4-3x+6 = 13
-3x+10=13
-3x=3
x=-1
b) -9(2y-7) + 4y=5(1-y) - 2(1-3y)
-18y + 63 + 4y = 5 - 5y - 2 + 6y
-14y+63=3+y
15y=60
y = 4
c) 5(2a-3)-6(3a-4)=5a-4
10a-15-18a+24=5a-4
-8a+9=5a-4
13a=13
a=1
d) 10z-3(2z+1)=0,6
10z-6z-3=0,6
4z=3,6
z=0,9
e) 2w-0,4(1,2w + 1) = 0,72w
2w- 0,48w - 0,4 = 0,72w
1,52w - 0,4 = 0,72w
0,8w = 0,4
w = 0,5
W e) zamieniłem uł. zwykłe na dziesiętne.
a) 4 -3(x-2) =13
4 - 3x + 6 = 13
- 3x = 13 -4 -6
-3x = 3 /:(-3)
x = -1
Spr. 4-3(-1-2) =13
4 -3( -3) = 13
4 +9 = 13
13 = 13
L = P
b) -9(2y -7)+4y = 5(1-y) -2(1-3y)
-18y +63 +4y = 5 -5y -2 + 6y
- 18y +4y +5y -6y = 5 - 2 -63
- 15y = - 60 /(-15)
y = 4
Spr. -9(2*4 -7)+4*4 = 5(1-4) -2(1-3*4)
-9 *1 +16 = -15 +22
-9 +16 = 7
7 = 7
L = P
c) 5(2a -3)-6( 3a -4) = 5a -4
10a -15 -18a +24 = 5a -4
10a -18a -5a = -4 +15 -24
- 13a = -13 /:(-13)
a = 1
Spr. 5(2*1 -3) -6(3*1-4) = 5*1 -4
5* (-1) -6* (-1) = 5 -4
-5 +6 = 1
1 = 1
L = P
d) 10z -3(2z+1) = 0,6
10z -6z -3 = 0,6
10z -6z = 0,6 +3
4z = 3,6 /:4
z = 0,9
Spr. 10*0,9 -3(2*0,9 +1) = 0,6
9 - 3*2,8 = 0,6
9 - 8,4 = 0,6
0,6 = 0,6
L = P
e) 2w-2/5(1i1/5w +1) = 0,72w
2w -2/5( 6/5w +1) = 0,72w
2w -12/25w -2/5 = 0,72w /*25
50w -12w -10 = 18w
50w -12w -18w = 10
20w = 10 /:20
w = 10/20
w = 1/2
spr.2* 1/2 -2/5(1i1/5*1/2) = 0,72 *1/2
2/2 - 2/5(6/5 *1/2 +1) = 72/100 *1/2
1 - 2/5(3/5*1/1 +1) = 36/100 * 1/1
1 - 2/5 ( 3/5 +1) = 36/100
1 - 2/5 * (1i3/5) = 9/25
1 - 2/5 * 8/5 = 9/25
25/25 - 16/25 = 9/25
9/25 = 9/25
L = P