Question

Помогите пожалуйста очень сильно нужно

Answer 1

Просто подставляешь значения x и y в каждом примере:

1) x = -4; y = 5

x+y = -4 + 5 = 5-4 = 1

x-y = -4-5 = -(4+5) = -9

xy = -4 × 5 = -20

x:y = -4 : 5 = -0,8

2) x = -12; y = -3

x+y = -12+(-3) = -12-3 = -(12+3) = -15

x-y = -12-(-3) = -12+3 = 3-12 = -9

xy = -12×(-3) = 36

x:y = -12:(-3) = 4

3) x = 7; y = -0,2

x+y = 7+(-0,2) = 7-0,2 = 6,8

x-y = 7-(-0,2) = 7+0,2 = 7,2

xy = 7×(-0,2) = - 1,4

x:y = 7:(-2) = - 3,5

4) x = -3,6; y= -2,5

x+y = -3,6 +(-2,5) = -3,6-2,5 = -(3,6+2,5) = -6,1

x-y = -3,6-(-2,5) = -3,6+2,5 = -1,1

xy = -3,6×(-2,5) = 9

x:y = -3,6:(-2,5) = 1,44

5) x = -2/7; y = 3/14

x+y = -2/7+3/14 = -4/14+3/14 = -1/14

x-y = -2/7-3/14 = -(2/7+3/14) = -(4/14+3/14) = -7/14 = -1/2

xy = -2/7×3/14 = -6/98 = -3/49

x:y = -2/7:3/14 = -2/7×14/3 = -28/21 = -4/3 = -1 1/3

6) x = 1 1/2 = 3/2; y = -1 1/4 = -5/4

x+y = 3/2+(-5/4) = 3/2-5/4= 6/4-5/4 = 1/4

x-y = 3/2-(-5/4) = 3/2+5/4 = 11/4 = 2 3/4

xy = 3/2×(-5/4) = -15/8 = -1 7/8

x:y = 3/2:(-5/4) = 6/4:(-5/4) = 6/4×(-4/5) = -6/5 = -1 1/5