Odpowiedź:
15 + x = 25 to x= 10
7 - x = -1 to x=8
3 - x = 5 to x = -2
x -16 = 4 to x = 20
3x = 21 to x = 7
x*4 =36 to x=9
x :8 = 4 to x = 32
64 : x = 16 to x = 4
Szczegółowe wyjaśnienie:
1)
[tex]15+x=25\\x=25-15\\x=10[/tex]
2)
[tex]7-x=-1\\-x=-1-7\\-x=-8\\x=8[/tex]
3)
[tex]3-x=5\\-x=5-3\\-x=2\\x=-2[/tex]
4)
[tex]x-16=4\\x=4+16\\x=20[/tex]
5)
[tex]3x=21\\3x:3=21:3\\x=7[/tex]
6)
[tex]x*4=36\\4x=36\\x=9[/tex]
7)
[tex]x:8=4\\\frac{1}{8}x=4\\x=32[/tex]
8)
[tex]64:x=16\\\frac{64}{x}=16\\16x=64\\x=4[/tex]
