Question

Даю 30 б.выполните умножение и запишите результат. а)7 1/4*8=(7+1/4)*8=7*8+1/4*8= б)5 2/3*6= в)4*1 1/2= г)70*2 1/2= д)35 2/5*5= е)9*1 1/18= ж)2 1/3*2=

Answer 1

/этот знак что у тебч значит??

Answer 2

Sure! Let's solve each multiplication problem step by step:

a) 7 1/4 * 8 = (7 + 1/4) * 8 = 7 * 8 + 1/4 * 8

To multiply whole numbers, we multiply them directly:

7 * 8 = 56

To multiply a whole number and a fraction, we multiply the whole number by the numerator of the fraction and divide by the denominator:

1/4 * 8 = (1 * 8) / 4 = 8 / 4 = 2

Now we add the two results together:

56 + 2 = 58

So, 7 1/4 * 8 = 58.

b) 5 2/3 * 6:

To multiply a whole number and a mixed number, we can convert the mixed number into an improper fraction and then proceed with the multiplication.

5 2/3 can be converted to an improper fraction as (5 * 3 + 2) / 3 = 17/3.

Now we can multiply:

17/3 * 6 = (17 * 6) / 3 = 102/3.

c) 4 * 1 1/2:

4 * 1 1/2 = 4 * (1 + 1/2) = 4 * 3/2 = (4 * 3) / 2 = 12/2 = 6.

d) 70 * 2 1/2:

70 * 2 1/2 = 70 * (2 + 1/2) = 70 * 5/2 = (70 * 5) / 2 = 350/2 = 175.

e) 35 + 2/5 * 5:

35 + 2/5 * 5 = 35 + (2 * 5) / 5 = 35 + 10/5 = 35 + 2 = 37.

f) 9 * 1 1/8:

9 * 1 1/8 = 9 * (1 + 1/8) = 9 * 9/8 = (9 * 9) / 8 = 81/8.

g) 2 1/3 * 2:

2 1/3 * 2 = (2 * 3 + 1) / 3 * 2 = (6 + 1) / 3 * 2 = 7/3 * 2 = (7 * 2) / 3 = 14/3.

So, the results are: a) 7 1/4 * 8 = 58 b) 5 2/3 * 6 = 102/3 c) 4 * 1 1/2 = 6 d) 70 * 2 1/2 = 175 e) 35 + 2/5 * 5 = 37 f) 9 * 1 1/8 = 81/8 g) 2 1/3 * 2 = 14/3