Разность это со знаком минус
7-1
8-3=5
7-2
4-4
9-4=5
5-3=2
10-5=5
6-5
Sina>0
cosa<0
tga=-3/4
4sina=-3cosa
tg^2a+1=1/cos^2a
cos^2a=1/(1+tg^2a)=1/(25/16)=16/25
cosa=-4/5
sina=3/5
<span>sin(π/4+a)=sina*√(2)/2+cosa*√(2)/2=√(2)/2(sina+cosa)=-√(2)/10≈0.1414</span>
<span>200:2*(540+460):10=200:2*1000:10=10000</span>
<span>200:2*540+460:10=100*540+46=54046</span>
<span>200:2*(540+460:10)=200:2*586=58600</span>
1200-200:40*5*5=1200-5*5*5=1075
1200-200:(40*5)*5=1200-200:200*5=1195
(1200-200:40)*5*5=1195*5*5=29875