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Evaluate: (65тАЛ)+(42тАЛ)1тАЛ├╖294тАЛ
5165тАЛ
5167тАЛ
521тАЛ
5169тАЛ
5167тАЛ
Convert the fractions to a common denominator (12) quickly: 5/6 becomes 10/12 and 2/4 becomes 6/12, summing to 16/12 or 4/3. The expression then simplifies to 1 / (4/3) = 3/4, followed by multiplication with 29/4.
An arithmetic expression involving fractions: 1 / (5/6 + 2/4) ├╖ 4/29.
baтАЛ├╖dcтАЛ=baтАЛ├ЧcdтАЛ
Convert the fractions to a common denominator (12) quickly: 5/6 becomes 10/12 and 2/4 becomes 6/12, summing to 16/12 or 4/3. The expression then simplifies to 1 / (4/3) = 3/4, followed by multiplication with 29/4.
Students often add 5/6 and 2/4 as (5+2)/(6+4) = 7/10, which is mathematically incorrect; they must use the Least Common Multiple (LCM) of denominators.
Simplify the denominator sum
Find the LCM of 6 and 4, which is 12, then add the fractions: 65тАЛ+42тАЛ=1210тАЛ+126тАЛ=1216тАЛ=34тАЛ
34тАЛ
Perform the division in the main expression
Now evaluate the reciprocal of the sum and multiply by the division factor: 1├╖34тАЛ├╖294тАЛ=43тАЛ├╖294тАЛ
43тАЛ├Ч429тАЛ
Calculate final product
Multiply the numerators and denominators: 4├Ч43├Ч29тАЛ=1687тАЛ
1687тАЛ
Convert to mixed fraction
Divide 87 by 16: 87=16├Ч5+7, resulting in the mixed number 5167тАЛ.
5167тАЛ
B is correct because the final calculated value is 87/16, which is equal to the mixed fraction 5 7/16.
Always convert division of fractions into multiplication by the reciprocal to avoid errors during complex calculations.