4/25+15/4=(4*4)+(15*25)/100=16+375/100=391/100=3.91
1) 3a(1-a²)= 3a(1-a)(1+a)
2) 14(1-m²)= 14(1-m)(1+m)
А) х⁶-10х⁴+11х³-х+14
х=-2;
(-2)⁶-10·(-2)⁴+11·(-2)³-(-2)+14=64-160-88+2+14=-168
б)а³-14а³-6аб²+б+2=-13а³-6аб²+б+2
а=-1;б=0,5;
-13·(-1)³-6·(-1)·(0,5)²+0,5+2=13+1,5+2,5=17
- 2*( - 5)^24 > (-5)^25
- 2* 5^24 > - 5*5^24 // сократим
- 2 > - 5