Question

(9/11-5/22)•88; (13/15-1/5)•30; 12 7/40•80

Answer 1

В последнем примере действия не совсем понятны. куда девать 12?

Answer 2

(9/11-5/22)•88=(18/22-5/22)88=13/22•88=52
(13/15-1/5)•30=(13/15-3/15)•30=2/3•30=20
А какой зак после 12 в третьем?

Answer 3

Let's solve each expression step by step:

1. (9/11 - 5/22) • 88

First, simplify the expression inside the parentheses:

(9/11) - (5/22) = (198/22) - (5/22) = (198 - 5) / 22 = 193/22

Now, multiply the result by 88:

(193/22) • 88 = 193 • (88/22) = 193 • 4 = 772

So, the result of (9/11 - 5/22) • 88 is 772.

2. (13/15 - 1/5) • 30

Again, simplify the expression inside the parentheses:

(13/15) - (1/5) = (13/15) - (3/15) = (13 - 3) / 15 = 10/15

Now, multiply the result by 30:

(10/15) • 30 = 10 • (30/15) = 10 • 2 = 20

So, the result of (13/15 - 1/5) • 30 is 20.

3. 12 7/40 • 80

To multiply a mixed number (12 7/40) by a whole number (80), first convert the mixed number to an improper fraction:

12 7/40 = (12 * 40 + 7) / 40 = 487/40

Now, multiply the improper fraction by 80:

(487/40) • 80 = (487 • 80) / 40 = 38960/40

Finally, simplify the fraction:

38960/40 = 974

So, the result of 12 7/40 • 80 is 974.

To summarize:

1. (9/11 - 5/22) • 88 = 772
2. (13/15 - 1/5) • 30 = 20
3. 12 7/40 • 80 = 974