Question

7*12+7*20= -7*( ) 7*12-7*20= 7*( ) 7*12-7*20= -7*( ) -7*12+7*20= 7*( ) -7*12+7*20= -7*( ) -7*12-7*20=7*( ) -7*12-7*20=-7*( )

Answer 1

-7*(-12-20)

7*(12-20)

-7*(-12+20)

7*(-12+20)

-7*(12-20)

7*(-12-20)

-7*(12+20)

Answer 2

Let's calculate each of these expressions:

1. $7 \cdot 12 + 7 \cdot 20 = -7 \cdot (-68)$ Result: $84 + 140 = 476$

2. $7 \cdot 12 - 7 \cdot 20 = 7 \cdot (-8)$ Result: $84 - 140 = -56$

3. $7 \cdot 12 - 7 \cdot 20 = -7 \cdot (-56)$ Result: $84 - 140 = 392$

4. $-7 \cdot 12 + 7 \cdot 20 = 7 \cdot 68$ Result: $-84 + 140 = 952$

5. $-7 \cdot 12 + 7 \cdot 20 = -7 \cdot 68$ Result: $-84 + 140 = -952$

6. $-7 \cdot 12 - 7 \cdot 20 = 7 \cdot 68$ Result: $-84 - 140 = -1196$

7. $-7 \cdot 12 - 7 \cdot 20 = -7 \cdot 68$ Result: $-84 - 140 = 1196$

So, the missing values in the expressions are as follows:

1. $7 \cdot 12 + 7 \cdot 20 = -7 \cdot (-68)$ is $476$
2. $7 \cdot 12 - 7 \cdot 20 = 7 \cdot (-8)$ is $-56$
3. $7 \cdot 12 - 7 \cdot 20 = -7 \cdot (-56)$ is $392$
4. $-7 \cdot 12 + 7 \cdot 20 = 7 \cdot 68$ is $952$
5. $-7 \cdot 12 + 7 \cdot 20 = -7 \cdot 68$ is $-952$
6. $-7 \cdot 12 - 7 \cdot 20 = 7 \cdot 68$ is $-1196$
7. $-7 \cdot 12 - 7 \cdot 20 = -7 \cdot 68$ is $1196$