Temat: Rozwiązywanie równań I stopnia z jedną niewiadomą.
Zad.
a) 8x-2=4x+30
b) x-(x+3)=2(x-15)
c) 5 (x-2)+7=11x-27
d) 7-3(x+10)=(10+6(2-3x)
e) 2(x-1)+3(x-2)=2
f) 4-(5x+2) * 6-3(x+2)=30
g) 1/2(x-2)=3/4x-2,5
h) 2x-1/3= 11-x/2
;))
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Zad.
a) 8x-2=4x+30
8x -4x = 30 +2
4x = 32 /:4
x = 8
b) x-(x+3)=2(x-15)
x -x -3 = 2x -30
-2x = -30 +3
-2x = -27
x = (-27)/(-2)
x = 13,5
c) 5 (x-2)+7=11x-27
5x -10 +7 = 11x -27
5x -11x = -27 +3
-6x = -24 /:(-6)
x = 4
d) 7-3(x+10)=(10+6(2-3x)
7 -3x -30 = 10 +12 -6x
-3x -23 = -6x +22
-3x +6x = 22 +23
3x = 45 /:3
x = 15
e) 2(x-1)+3(x-2)=2
2x -2 + 3x -6 =2
5x - 8 =2
5x= 2+8
5x = 10 /:5
x = 2
f) 4-(5x+2) * 6-3(x+2)=30
4 -30x -12 - 3x -6 = 30
-33x -14 = 30
-33x = 30 +14
-33x = 44 /:(-33)
x = - 44/33
x = - 4/3
g) 1/2(x-2)=3/4x-2,5
1/2x -1 = 3/4x - 5/2
2/4x -3/4x = -5/2 +1
-1/4x = -3/2
x = (-3/2)*(-4/1)
x = 6
h) 2x-1/3=( 11-x)/2 /*6
6x -2 = 11-x
6x +x = 11 +2
7x = 13 /:7
x = 13/7