Question

-5,2(-3)+51(-0,4)-(-7,8) (2)

Answer 1

1) -5,2*(-3)=15,6
2) 51*(-0,4)=-10,4
3) как я поняла там -7,8*(-2)=15,6
а если там -7,8*2=-15,6
4) 15,6-10,4=5,2
5) 5,2-15,6=-10,4(если в третьем действии -2)
5,2+15,6=20,8(если в третьем действии просто 2)

Answer 2

Let's simplify the expression step by step:

1. Start with the first part of the expression: -5 * 2(-3)

   To calculate this, we first need to multiply 2 by -3: -5 * (-6)

   Now, multiply -5 by -6: 30

2. Move on to the second part of the expression: 51 * (-0.4)

   To calculate this, simply multiply 51 by -0.4: -20.4

3. Finally, simplify the last part of the expression: -(-7.8) * 2

   To remove the double negative, we can rewrite it as a positive: 7.8 * 2

   Now, multiply 7.8 by 2: 15.6

Now, add all these results together:

30 + (-20.4) + 15.6

Now, perform the additions:

30 - 20.4 + 15.6 = 25.2

So, the value of the expression is 25.2.