1 1/2 =3/2
22.5 =225/10 =45/2
1 2/3 =5/3
1) 3/2 : 45/2 * 5/3 =3/2 *2/45 *5/3 =(3*2*5) /(2*45*3) =5/45 =1/9
2) 6 -1/9 =5 9/9 -1/9 =5 8/9 =53/9
3) 53/9 - (-2/3) =53/9 +2/3 =(53 +2*9)/9 =(53 +18)/9 =71/9 =7 8/9
Arccos корень3/2 +arcsin(-1)=-60
<span>(х2— х + 1) (х2+ х + 1)=(x2+1-x)(x2+1-x)=(x2+1)2-x2=x4+2x2+1-x2=x4+x2+1</span>