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Proszę i pomoc na dziś

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Odpowiedź :

Tomson77viz

[tex]A) 7+x=25\\x=18\\B) x+18=11\\x=-7\\C) 12-x=20\\x=-8\\D) x-17=15\\x=32\\E) 7*x=21\\x=3\\F) x*5=\frac{1}{5} \\x=\frac{1}{25} \\G) x:100=0\\x=0\\H) 80,1:x=1\\x=80,1\\I) \frac{1}{5} x=2\\x=10[/tex]

Basetlaviz

7.

a)

[tex]7+x = 25\\\\x = 25-7\\\\x = 18[/tex]

b)

[tex]x+18 = 11\\\\x = 11-18\\\\x = -7[/tex]

c)

[tex]12-x = 20\\\\-x = 20-12\\\\-x = 8 \ \ /:(-1)\\\\x = -8[/tex]

d)

[tex]x-17 = 15\\\\x = 15+17\\\\x = 32[/tex]

e)

[tex]7\cdot x = 21 \ \ /:7\\\\x = 7[/tex]

f)

[tex]x \cdot 5 = \frac{1}{5} \ \ /:5\\\\x = \frac{1}{25}[/tex]

g)

[tex]x:100 = 0 \ \ /\cdot 100\\\\x = 0[/tex]

h)

[tex]80,1:x = 1\\\\x = 80,1[/tex]

i)

[tex]\frac{1}{5}x = 2 \ \ /\cdot5\\\\x = 10[/tex]

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