Question

12,1 - 2 ( 1 1/4 + 2 × 1 3/10 ) + 4 × 1,4​

Answer 1

Ответ:

7

Объяснение:

2*13/10=26/10=2 3/5=2,6

11/4+2 3/5=55/20+52/20=107/20= 5 7/20=5,35

2* 5,35=10,7

4*1,4=5,6

12,1-10,7+5,6=7

Answer 2

To simplify the expression:

12.1 - 2 * (1 1/4 + 2 * 1 3/10) + 4 * 1.4

First, let's deal with the fractions and the multiplication inside the parentheses:

1 1/4 = 5/4 1 3/10 = 13/10

Now, we can calculate the values inside the parentheses:

1 1/4 + 2 * 1 3/10 = 5/4 + 2 * 13/10

Now, calculate the values inside the parentheses:

5/4 + 26/10

Now, find a common denominator, which is 20:

(5/4 * 5/5) + (26/10 * 2/2) = 25/20 + 52/20

Now, add the fractions inside the parentheses:

(25/20 + 52/20) = 77/20

Now, substitute this value back into the original expression:

12.1 - 2 * (77/20) + 4 * 1.4

Now, calculate the remaining multiplications:

12.1 - (154/20) + 5.6

Now, let's simplify the fractions and perform the subtraction:

12.1 - (77/10) + 5.6

To subtract fractions, they need a common denominator. In this case, it's 10:

(121/10) - (77/10) + 5.6

Now, subtract the fractions:

(121/10 - 77/10) + 5.6 = 44/10 + 5.6

Now, simplify:

(22/5) + 5.6

To add these, you can find a common denominator, which is 5:

(22/5 + 28/5) = 50/5

Finally, simplify further:

50/5 = 10

So, the simplified value of the expression is 10.