Question

РЕШИТЕ СРОЧНО! ДАЮ 40 БАЛЛОВ

Answer 1

1)

15*(-7)=-15*7=-105

-14*(-17)=(-1)*(-1)*14*17=1*238=238

-0,9*4,1=-3,69

(-3/16)*(-3 5/9)=(-1)*(-1)*(3/16)*(32/9)=

=1*(32/16)*(3/9)=2*1/3=2/3

2)

-84:14=-(84:14)=-6

-42:(-6)=(-1):(-1) * (42:6) = 1*7=7

0,114:(-0,76) = 1:(-1) * (0,114:0,76) = -1*0,15 = -0,15

-6 4/9 : (-3 1/3) = (-1):(-1) * (58/9 : 10/3)=

= 1*(58/9 * 3/10) = 29/3 * 1/5 =29/15 = 1 14/15

4)

5/12 = 0,41(6) ≈ 0,42

6 2/9 = 6,(2) ≈ 6,22

Answer 2

1.
а) 15 • (-7) = -15•7 = -105
б) -14 • (-17) = 14 • 17 = 238
в) -0,9 • 4,1 = -3,69
г) -3/16 • (-3 5/9) = 3/16 • 3 5/9 =
= 3/16 • 32/9 = 2/3

2).
а) -84 : 14 = -6
б) -42 : (-6) = 42 : 6 = 7
в) 0,114 : (-0,76) = -0,114 : 0,76 = -0,15
г) -6 4/9 : (-3 1/3) = 6 4/9 : 3 1/3 =
= 58/9 : 10/3 = 58/9 •3/10 = 29/15 = 1 14/15

4.
5/12 = 0,416666(6) ≈ 0,42
6 2/9 = 56/9 = 6,22222222(2) ≈ 6,22