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We will use the distributive property and multiply each term in parentheses by 4:
We will solve the exercise from left to right.
We will solve the first multiplication exercise vertically. We will make sure to write correctly and multiply ones by ones, and ones by tens as follows:
We get the result: 72.
Let's solve the remaining multiplication exercises:
Now we'll connect all the results in the following way:
We will solve the exercise vertically, making sure to write correctly and add ones with ones and tens with tens, as follows:
We'll add all the ones together and get: 2
We'll add all the tens together and get: 13
Therefore, we got the number:
\( 20\div(4+1)-3= \)
While the distributive property does work here, it's more complex and error-prone. Following PEMDAS (Parentheses first) is clearer: solve 10+5+18=33, then multiply by 4.
Without parentheses, you'd follow left-to-right for same operations. But parentheses change everything - they always come first in order of operations!
Use PEMDAS: Please Excuse My Dear Aunt Sally
No, it's mathematically correct! The distributive property works. However, it's usually easier to add inside parentheses first: 33×4 is simpler than 4×10+4×5+4×18.
Double-check each step: First add 10+5+18=33, then multiply 33×4=132. Common errors include forgetting to add all three numbers or making arithmetic mistakes.
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