A)<span>√225*0.04=15*0.04=0.6
б) </span><span>√28*</span><span>√64=</span><span>√1764=42
в) </span><span>√48/3=</span><span>√16=4
г)</span><span>√2^6*7^2=</span><span><span>√64*49=8*49=392
</span> </span>
7×10/13=70/13=5 5/13 (пять целых и 5/13)
Держи, надеюсь, все понятно вам будет
Cos²a/2=(1+cosa)/2
cos²a/2=(1+7/18)/2=25/36
cosa/2=√25/36=5/6
21cos(a/2)=105/6=7.5
<span><u> y+1 </u> <u> </u> <u> 1-x </u> <u>--</u> <u>
</u><span>y^2-xy x^2-xy</span></span>
(y+1)/y(y-x)-(1-x)/x(x-y)=(x(y+1)+y(1-x))/xy(y-x)=(xy+x+y-xy)/xy(y-x)=(x+y)/xy(y-x)