Question

21*19-21*(19+21) Решите)))

Answer 1

21*19-21*(19+20)=21(19-39)=21*(-20)=-420

Answer 2

To solve the expression, we can use the order of operations, which is a set of rules that dictate the order in which mathematical operations should be performed. According to the order of operations, we should perform the operations inside parentheses first, then multiplication and division from left to right, and finally addition and subtraction from left to right. Using this rule, we can simplify the expression as follows:

2119 - 21(19+21) = 2119 - 2140 (performing the operation inside the parentheses first) = 399 - 840 (multiplying 21 by 19 and 40 respectively) = -441 (subtracting 840 from 399)

Therefore, 2119-21(19+21) = -441.