( ( 2a + 7b ) : 3 ) + ( ( 3a - 14b ) : 6 ) = ( 2( 2a + 7b ) + ( 3a - 14b )) / 6 = ( 4a + 14b + 3a - 14b ) / 6 = 7a / 6
0 / 6 = 0
Ответ 0
У=кх-5
10=к*(-2)-5
-2к=-5-10
-2к=-15
к=7,5
Sinkv a + coskv a =1
coskv a = 1-sinkv a
9 +5.sinkva -5(1-sinkv a)
9+5.sin kv a -5 + 5.sinkv a = 10 sinkv a +4