 ## CCSS.MATH.CONTENT.7.NS.A.2

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### In this Brief Review, division of rational numbers is explored. Note: The download is an MP4 file. ### In this Brief Review, multiplying rational numbers is explored. Note: The download is an MP4 file. ### Example 1: Combining rational expressions of the form 1/a + 1/b. ### Example 2: Combining rational expressions of the form 1/a - 1/b. ### Example 3: Combining rational expressions of the form 1/(ax) + 1/b, under the following conditions: a = 1, b > 0. ### Example 4: Combining rational expressions of the form 1/(ax) - 1/b, under the following conditions: a = 1, b > 0. ### Example 5: Combining rational expressions of the form 1/(ax) + 1/b, under the following conditions: a > 0, b > 0. ### Example 6: Combining rational expressions of the form 1/(ax) - 1/b, under the following conditions: a > 0, b > 0. ### Example 7: Combining rational expressions of the form 1/(ax) + 1/b, under the following conditions: a = b. ### Example 8: Combining rational expressions of the form 1/(ax) - 1/b, under the following conditions: a > 0, b > 0. ### Example 9: Combining rational expressions of the form a/(bx) + c/(dx), under the following conditions: a = c = 1, b > 0, d > 0. ### Example 10: Combining rational expressions of the form a/(bx) - c/(dx), under the following conditions: a = c = 1, b > 0, d > 0. ### Example 11: Combining rational expressions of the form a/(bx) + c/(dx), under the following conditions: a > 0, b > 0, c > 0, d > 0. ### Example 12: Combining rational expressions of the form a/(bx) - c/(dx), under the following conditions: a > 0, b > 0, c > 0, d > 0. ### Example 13: Combining rational expressions of the form 1/(x + a) + 1/b, under the following conditions: a = 1, b > 0. ### Example 14: Combining rational expressions of the form 1/(x + a) - 1/b, under the following conditions: a > 0, b > 0. ### Example 15: Combining rational expressions of the form 1/(x - a) + 1/b, under the following conditions: a > 0, b > 0. ### Example 16: Combining rational expressions of the form 1/(x - a) + 1/b, under the following conditions: a > 0, b > 0. ### Example 17: Combining rational expressions of the form 1/(x - a) - 1/b, under the following conditions: a > 0, b > 0. ### Example 18: Combining rational expressions of the form 1/(x + a) + 1/(x + b), under the following conditions: a > 0, b > 0. ### Example 19: Combining rational expressions of the form 1/(x + a) - 1/(x + b), under the following conditions: a > 0, b > 0. ### Example 20: Combining rational expressions of the form 1/(x - a) + 1/(x + b), under the following conditions: a > 0, b > 0. ### Example 21: Combining rational expressions of the form 1/(x + a) + 1/(x - b), under the following conditions: a > 0, b > 0. ### Example 22: Combining rational expressions of the form 1/(x - a) + 1/(x - b), under the following conditions: a > 0, b > 0. ### Example 23: Combining rational expressions of the form 1/(x + a) - 1/(x + b), under the following conditions: a > 0, b > 0. 