Ответы и объяснения

2013-07-11T09:18:03+04:00

1) 10 15/18 +2 17/18 =13 7/9

 

5 11/12 - 3 10/12 =2 1/12

2) 13,7-18,85 = - 5 ,15

-21,35+(-15,65)=-37

3) 12/17* 34/3 *(-1/4)=-2

1/5* 6/19* 38/3=4/5

4) abs(-4,5) +abs(3,6)=8,1

abs(-5,5)/abs(1,1)=5

5) 21,7 /( 3 7/15 - 1 2/15)=21,7 /  2 1/3 = 217/10 * 3 /7 = 31*3/10=6,3

(2 5/18 + 7/18) / 0,8 = 8/3 *10/8=10/3 =3 1/3

6)1,27*10^-3 > 5,41*10^-4

2,73*10^11 <1,81*10^12

7) sqrt(125/3)*sqrt(3/20)=sqrt(125/20)=sqrt(25/4)=5/2

sqrt(64/4)=sqrt(16)=4

8) 3/(sqrt(3)+sqrt(2)) +5/(sqrt(3)-sqrt(2))= (sqrt(3) (3 +5) + sqrt(2) (5-3)  )/ (3-2) = 8 sqrt(3) +2 sqrt(2)

3/(sqrt(3)+sqrt(2)) - 2/(sqrt(3)-sqrt(2))=sqrt(3) (3-2) +sqrt(2)(-3-2)= sqrt(3)-5sqrt(2)