1
-3/25+0,78*11/3=-0,12+0,26*11=-0,12+2,86=2,74
2
tg3π/8*tgπ/8+1=ctgπ/8*tgπ/8+1=1+1=2
3
<span>0.32* 10^5/0.8*10^3=(0,32/0,8)*(10^5:10</span>³)=0,4*10²=0,4*100=40
X-2/5 = 2/3 - 3x - 2/6
x + 3x = 2/3 - 2/6 + 2/5
4x = (2*10 - 2*5 + 2*6)/30
4x = (20 - 10 + 12)/ 30
4x = 22/30
x = 22/30 : 4
x = 22/30 * 1/4
x = 11/60
= 8х³+3*4х²*5+3*2х*25+125=8х³+60х²+150х+125
= (7z-1)(49z²+7z+1)
исходные не писал