Câu hỏi
1) Ginh a) -(5)/(6) cdot(-10)-(1)/(-2) b, -(3)/(4):(-(1)/(2))-(1)/(8) c) (-(2)/(3)+1):((-2)/(9))-(5)/(6): (1)/(3)
Giải pháp
4.3
(350 Phiếu)
Diệu Nga
thầy · Hướng dẫn 5 năm
Trả lời
To solve the expression
, we need to follow the order of operations (PEMDAS/BODMAS). This means we first handle any parentheses or brackets, then exponents or orders, followed by multiplication and division from left to right, and finally addition and subtraction from left to right.1. **Division**:
Dividing by a fraction is the same as multiplying by its reciprocal:
2. **Subtraction**:
Subtracting a negative is the same as adding its positive:
3. **Addition**: To add these fractions, we need a common denominator. The least common multiple of 2 and 8 is 8.
So,
Therefore, the solution to the expression
is:
In decimal form, this is:
In percentage form, this is:
So, the final answer can be expressed as: