Rozwiąż : 5+7x= -(3-2x)-3x=?
7(1-3a)=6-(a-4)=?
3/4z-(z-4)= 2/3(z-2)=?
3x+13-x+14,5=41-3x+4,5+x=?
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a)
5+7x= -(3-2x)-3x
5 + 7x = - 3 + 2x - 3x
7x -2x + 3x = -3 - 5
8x = - 8 / : 8
x = -1
b)
7(1-3a)=6-(a-4)
7 - 21a = 6 - a + 4
-21a + a = 6 + 4 - 7
-20a = 3 / : (-20)
a = - 3/20
c)
3/4z-(z-4)= 2/3(z-2) / * 12
9z - 12(z-4) = 8( z-2)
9z - 12z + 48 = 8z - 16
9z -12z - 8z = -16 -48
-11z = -64 /: (-11)
z = 64/11
z = 5 i 9/11
d)
3x+13-x+14,5=41-3x+4,5+x
3x -x +3x -x = 41 + 4,5 -13 - 14,5
4x = 18 /:4
x = 18/4
x = 4i 2/4
x = 4 i 1/2