Question

1.(-1,6+2,3)*(-2/21) 2. (-9/14-5/21):2 9/14срочнооооо​

Answer 1

Відповідь:1.-0.06666666666.

2.-0.33333333333

(не копировала)

Answer 2

1. To calculate the expression (-1 + 6 + 2.3) * (-2/21), follow the order of operations (PEMDAS/BODMAS):

First, add -1, 6, and 2.3: -1 + 6 + 2.3 = 7.3

Then, multiply the result by -2/21: 7.3 * (-2/21) = -0.6952381...

Therefore, the result of (-1 + 6 + 2.3) * (-2/21) is approximately -0.6952381.

2. To simplify the expression (-9/14 - 5/21) ÷ (2 9/14), you need to convert the mixed number into an improper fraction:

2 9/14 = (2 * 14 + 9) / 14 = 37/14

Now, rewrite the expression: (-9/14 - 5/21) ÷ (37/14)

To divide fractions, you multiply by the reciprocal of the divisor. Therefore, divide by (37/14) is equivalent to multiplying by (14/37):

((-9/14) - (5/21)) * (14/37)

To subtract fractions with different denominators, you need a common denominator. In this case, the common denominator is the least common multiple (LCM) of 14 and 21, which is 42.

((-9/14) * (3/3) - (5/21) * (2/2)) * (14/37) (-27/42 - 10/42) * (14/37) (-37/42) * (14/37)

Now, simplify the expression: -37/42 * 14/37 = -518/777

Therefore, the result of (-9/14 - 5/21) ÷ (2 9/14) is -518/777.