Х+у=59
х-у=35
2х=59+35
2x=94
x=94:2=47
y=59-47=12
47+12=59
<span>47-12=35</span>
<span>(-2а³в)³(-5а²в)²=-8а⁹в³(25а⁴в²)=-200а¹³в⁵
(-3a²в³)³(-2a⁵в)²=-27а⁶в⁹(4а¹⁰в²)=-108а¹⁶в¹¹</span>
Sina=3/5
cos²a=1-9/25=16/25
cosa=4/5
tga=3/5 : 4/5 = 3/4
ctg=4/3
<span>(x+3)^3-x^3=((x+3)-x)*((x+3)^2+3x(x+3)+x^2)=3*(x^2+6x+9+3x^2+9x+x^2)=3*(5x^2+15x+9)</span>
(4,8-3/4)/ 9/14 = (48/10 - 3/4) * 14/9 = (96/20 - 15/20) * 14/9 = 81/20 * 14/9 =
9/10 * 7 = 63/10 = 6,3