1.?
2.?
3.?
4.
5.:
6.:? "?"
7.(+=? -=? +=? -=? -? ====? =? =? )
:?
:?
:?
:3+x= 18
:x= 18-3
x= 15
:
4x+2(79-x)= 192
:4x+ 158-2x= 192
4x-2x+ 158= 192
2x+ 158= 192
2x= 192- 158
x= 17
6.? :
7.? :
1?
"?"
:
3+x= 18
:x= 18-3
x= 15
-
4x+2(79-x)= 192
:4x+ 158-2x= 192
4x-2x+ 158= 192
2x+ 158= 192
2x= 192- 158
2x=34
x= 17
-
r=6.28(? )
=3. 14 1592? 3. 14?
:3. 14r=6.28
r=6.28/3. 14
r=2
x? x? x