Х:8 =5 (500делим на сто) х =5умноженое на 8 =40
90 :у =10 (200-190) у=90:10
=9
а). 2a-9b-4a-3b+20b= -2a+8b; б). 18a-3a+7b-4a+2b=11a+9b.
( 23 + Х ) + ( 8х - 41 ) = 15
23 + Х + 8х - 41 = 15
9х = 15 + 18
9х = 33
Х = 33/9
Х = 11/3
Х = 3 ( 2/3 )
<span>5°<10<span>° => sin<span>5°=<span>5°*π/180<span>°=π/36=3,14/36≈0,09</span></span></span></span></span>