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2-7=4x
=x
b) 3/4x=2
x= 8/3
x=2i2/3
c) 8,4=-x/5
42=-x
-42=x
d) 5-8x=2
5=2+8x
3=8x
3/8=x
I to drugie:
a) 1 - 6 = 4
1 - 2(2+x) = 4
1 - 4 - 2x = 4
-3 -2x = 4
-7 = 2x | ÷2
-3,5 = x
b) (x+2)(x-2) = (x+2)² +6
x² - 2² = x² + 4x + 4 + 6
x² -4 = x² + 4x + 10 | - x²
-4 = 4x + 10 | - 10
-14 = 4x | ÷ 4
-3,5 = x
spr. (-3,5 + 2)(-3,5 - 2) = (-3,5 + 2)² + 6
-1,5 · (-5,5) = (-1,5)² + 6
8,25 = 2,25+6
8,25 = 8,25