1, remove the brackets at the same level.
When there are multiple brackets in the expression, you can remove the brackets at the same level first. For example, in the expression (2x+3)(4x- 1), two brackets can be removed to get 2x*4x-2x* 1+3*4x-3.
2. Delete the brackets with low priority.
In an expression with multiple parentheses, you can delete the parentheses with low priority. For example, in the expression 2x*(3+4x)- 1, you can remove the brackets and get 2x*3+2x*4x- 1.
3. Delete the brackets containing the same operator.
When parentheses of the same operator exist in the expression, they can be deleted. For example, in the expression 2x+3*(4x- 1), you can remove the brackets and get 2x+3*4x-3.
Application of the rule of removing brackets in life
1, shopping calculation
In our daily life, when we go shopping in the supermarket, we often encounter various preferential activities, such as buy one get one free, discounts and so on. In this case, you can use the parenthesis rule to calculate the actual price paid. For example, if the original price of a commodity is 100 yuan, and the price is 20% off, you can remove the brackets and multiply the original price by the discount to get the actually paid price 80 yuan.
2. Loan calculation
When buying a house, a car and other large-scale consumption, it is usually necessary to pay part of the amount with a loan. The bank will give the loan interest rate when lending, and the actual repayment amount needs to be calculated according to the loan principal, interest rate and repayment period. Here you can use the bracket removal rule to simplify the calculation process, such as calculating the monthly repayment amount under the equal principal and interest repayment method.
3. Calculation of coupon
In online shopping or its consumption scenarios, coupons are often used to save money. Coupons usually have certain usage rules, such as full reduction, discount and so on. When calculating the actual payment amount, you can use the bracket removal rule to multiply the discount amount of the coupon by the commodity price, so as to get the actual payment amount.
4. Investment calculation
When investing in financial management, it is often necessary to calculate the income of the portfolio. In this case, the rule of deleting brackets can be used to simplify the calculation process. For example, when calculating the income of stock portfolio, you can remove the brackets and multiply the income of various stocks to get the overall income of the portfolio.
5. Math contest
In mathematics competition, the rule of removing brackets is a common problem-solving skill. Mastering this law is helpful to simplify complex mathematical expressions and solve problems faster. For example, in the calculation of polynomial operations in mathematical competitions, brackets can be removed by the rule of brackets removal, thus simplifying the calculation process.