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Can you help me solve this?
ok how do I solve this 5/7-(-1/6-8/7)
and how do I solve this 12+3(3^2-1)/2(3)-4
3 Answers
- DavidLv 71 decade agoFavorite Answer
work inside out with brackets
30/42 - (-7/42 - 48/42)
30/42 - (-55/42)
30/42 + 55/42
85/42
12+3(3^2-1) / 2*3-4
12+3(9-1) / 2*3-4
12+24/2*3-4
12+(12*3)-4
48-4=
44
- ?Lv 61 decade ago
Make them all the same common denominator first, then add:
5/7 = 30/42
1/6 = 7/42
8/7 = 48/42
So, 30/42 -(-7/42-48/42) = 85/42
As for the other one, 12+3(3^2-1)/2(3)-4 = 12 + 3(9-1)/6-4 = 12 + 24 / 2 = 12 + 12 = 24, assuming the parentheses were correctly placed.
- 1 decade ago
Here are some tips that will help you solve any such problem.
Always evaluate what is inside parentheses or brackets first.
Look up the topic 'operator precedence' in computer books or on the net. That will give you an idea about how to evaluate something like 2*2+3 when there are no brackets. This is evaluated as (2*2)+3 = 4+3=7.
