Question

Вычислить удобным способом: а)-8,5+(-3)+8,5; б)6,2+(-1)+(-6,2); в)-12+6+12+(-7); г)-12,35+(-8,91)+(-13,28)+8,91+12,35; д)-123+58+(-51)+34+(-126)+118; е)-1,32+2,41+3,77+(-4,68)+0,59; ж)-2,43+6,31+(-3,21)+0,49+4,87.

Answer 1

Ответ:

А) 20

Б) - 1

В)-1

Г)27.98

Д)84

Е)0.77

Ж)11.51

Answer 2

a) -8.5 + (-3) + 8.5:

To calculate this expression, we can simply add the numbers together:

-8.5 + (-3) + 8.5 = -11.5 + 8.5 = -3

So the result of this expression is -3.

b) 6.2 + (-1) + (-6.2):

Again, we can add the numbers together to calculate the expression:

6.2 + (-1) + (-6.2) = 5.2 + (-6.2) = -1

The result is -1.

c) -12 + 6 + 12 + (-7):

Adding the numbers together:

-12 + 6 + 12 + (-7) = -6 + 5 = -1

The result is -1.

d) -12.35 + (-8.91) + (-13.28) + 8.91 + 12.35:

Adding the numbers:

-12.35 + (-8.91) + (-13.28) + 8.91 + 12.35 = -24.54 + 24.54 = 0

The result is 0.

e) -123 + 58 + (-51) + 34 + (-126) + 118:

Adding the numbers:

-123 + 58 + (-51) + 34 + (-126) + 118 = -210 + 210 = 0

The result is 0.

f) -1.32 + 2.41 + 3.77 + (-4.68) + 0.59:

Adding the numbers:

-1.32 + 2.41 + 3.77 + (-4.68) + 0.59 = 1.87 + (-4.68) = -2.81

The result is -2.81.

g) -2.43 + 6.31 + (-3.21) + 0.49 + 4.87:

Adding the numbers:

-2.43 + 6.31 + (-3.21) + 0.49 + 4.87 = 4.75 + (-3.21) = 1.54

The result is 1.54.

So, here are the results for each expression: a) -3 b) -1 c) -1 d) 0 e) 0 f) -2.81 g) 1.54