Rozwiąż równania:
a) 87=2x-5
b) 1/4(4x-3)=3-x
c) 87=3x-6
d) 1/5(5x-4)=4-x
a) 87=2x-5-2x = -5 - 87-2x = -92 /:(-2)x = 46b) 1/4(4x-3)=3-xx - 3/4 = 3 - x x + x = 3 + 0,752x = 3,75 /:2x = 1,875c) 87=3x-6-3x = -6 - 87-3x = -93 /:(-3) x = 31d) 1/5(5x-4)=4-xx - 4/5 = 4 - xx + x = 4 + 0,82x = 4,8 /:2x = 2,4
a) 87 = 2x -5
-2x = -5 -87
-2x = - 92 /:(-2)
x = 46
b) 1/4 (4x -3) = 3 -x
x - 3/4 = 3-x /*4
4x - 3 = 12 - 4x
4x +4x = 12 +3
8x = 15 /:8
x = 15/8
c) 87 = 3x -6
-3x = -6 -87
-3x = -93 /:(-3)
x = 31
d) 1/5(5x -4) = 4-x
x - 4/5 = 4 -x /*5
5x - 4 = 20 -5x
5x + 5x = 20 +4
10x = 24 /:10
x = 2,4
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a) 87=2x-5
-2x = -5 - 87
-2x = -92 /:(-2)
x = 46
b) 1/4(4x-3)=3-x
x - 3/4 = 3 - x
x + x = 3 + 0,75
2x = 3,75 /:2
x = 1,875
c) 87=3x-6
-3x = -6 - 87
-3x = -93 /:(-3)
x = 31
d) 1/5(5x-4)=4-x
x - 4/5 = 4 - x
x + x = 4 + 0,8
2x = 4,8 /:2
x = 2,4
a) 87 = 2x -5
-2x = -5 -87
-2x = - 92 /:(-2)
x = 46
b) 1/4 (4x -3) = 3 -x
x - 3/4 = 3-x /*4
4x - 3 = 12 - 4x
4x +4x = 12 +3
8x = 15 /:8
x = 15/8
c) 87 = 3x -6
-3x = -6 -87
-3x = -93 /:(-3)
x = 31
d) 1/5(5x -4) = 4-x
x - 4/5 = 4 -x /*5
5x - 4 = 20 -5x
5x + 5x = 20 +4
10x = 24 /:10
x = 2,4