Guanghui Furniture Factory wants to make 70 sets of tables and chairs, and has been doing it for 6 d

Solution: 70-6 9 = 16 (sets).

A: You still need to do 16 sets to complete the task.

In the formula with parentheses, it is necessary to calculate the inside of (small parentheses) first, then the inside (middle brackets), and finally the outside of the parentheses.

1. Four mixed operation sequences: when the same level is calculated, it is calculated from left to right; In two-level operations, multiplication and division are calculated first, and addition and subtraction are calculated later.

When there are parentheses, count the inside of the brackets first, and then the outside of the brackets; When there are multiple layers of parentheses, count the ones in the small brackets first, then the inside of the middle brackets, then the inside of the braces, and finally the outside of the brackets.

2. Multiplication is a simple operation of addition, and division is a simple operation of subtraction. Subtraction and addition are inverses of each other, and division and multiplication are inverses of each other.

Several additions are added together, and the position of the addition can be arbitrarily exchanged; Or add a few additions and then add them to the other additions, and their sum does not change.

The sum of two numbers subtracted from a number is equal to the subtraction of each additional number in the sum from this number.

Solution: 70-6 9 = 16 (sets).

A: You still need to do 16 sets to complete the task.

6*9=54

70-6*9=16 sets.

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