<span>2cos(3</span>π<span>-</span>β<span>)-sin(</span>π<span>/2+</span>β<span>):5cos(</span>β<span>-</span>π<span>)=(2cos(2</span>π+(π-β))-cosβ)/5cos(π-β)=
=(2cos(π-β)-cosβ)/-5cosβ=(-2cosβ-cosβ)/-5cosβ=-3cosβ/-5cosβ=3/5=0,6.
6 и 9 => 3; 75 и 45 => 15; 81 и 243 => 81; 4725 и 7875 => 1575.
1%-5
20%-100
или 1/5*500=100
ответ 100
96:8=12(ОКР.мир)
12+78=90(рус язык)
96+12+90=198(всего)