机智问答|哪些话支撑你熬过了整个高三？的专业问题解答

机智问答|哪些话支撑你熬过了整个高三？的专业问题解答

9/7x(6/5-12/7)怎么做？

Hello! To simplify the expression 9/7x(6/5-12/7), we follow the order of operations, which is parentheses first, then multiplication and division from left to right, and finally addition and subtraction from left to right. First, in the parentheses, we simplify the expression: (6/5 - 12/7). To simplify fractions, we need to find a common denominator. The least common multiple (LCM) of 5 and 7 is 35, so we can rewrite the expression as follows: (6/5) - (12/7) = (6/5)(7/7) - (12/7)(5/5) = 42/35 - 60/35 Now that the fractions have the same denominator, we can subtract them: = (42 - 60)/35 = -18/35 Now, we can substitute this result back into the original expression: 9/7x(-18/35) Next, we perform the multiplication: (9/7)(-18/35) = (9*-18)/(7*35) = -162/245 So, the simplified expression is -162/245.

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从12十14十16十18一直偶数相加加到48等于多少？

12十14十16十18等于60。 偶数相加的和从12到60需要找到连续的偶数，其中48也是偶数。 12 + 14 + 16 + 18 = 60 14 + 16 + 18 = 48 所以，偶数相加加到48等于48。

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