(1/2a)в7 *(1/2а)=
(-2,5)в3 *(-2,5а)в8=
(-9/7)в8:(-9/7)в5=
(3y/4)в4:(3y/4)в5=
(2а)в5::(2а)в3=
7ав(2а+3в)=
(7х-9)+(2х-8)=1
(0,2х-7)-(6-0,1х)=2

(1/2a)b⁷* 1/2a= (1/4a²)*b⁷(-2.5)b³* (-2.5a)b⁸= 6.25ab¹¹(-9/7)b⁸/(-9/7)b⁵= b³(3y/4) b⁴ / (3y/4) b⁵= 1/b(2a)b⁵/(2a)b³=b²7ab(2a+3b)= 14a²b+21ab²(7x-9)+(2x-8)=1 7x-9+2x-8=19x-17=19x=18x=2(0.2x-7)-(6-0.1x)=20.2x-7-6+0.1x=20.3x-13=20.3x=15x=50