通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²(3)2mn/4m²— 9与4m²n+6m/8m²—27急
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![通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²(3)2mn/4m²— 9与4m²n+6m/8m²—27急](/uploads/image/z/1344205-37-5.jpg?t=%E9%80%9A%E5%88%86%EF%BC%881%EF%BC%896c%2Fa%26%23178%3Bb%E4%B8%8Ec%2F3ab%26%23178%3B+%EF%BC%882%EF%BC%89x+-+y%2F2x%2B3y%E4%B8%8Exy%2F%EF%BC%88x%2By%EF%BC%89%26%23178%3B%EF%BC%883%EF%BC%892mn%2F4m%26%23178%3B%E2%80%94+9%E4%B8%8E4m%26%23178%3Bn%2B6m%2F8m%26%23178%3B%E2%80%9427%E6%80%A5)
通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²(3)2mn/4m²— 9与4m²n+6m/8m²—27急
通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²
(3)2mn/4m²— 9与4m²n+6m/8m²—27
急
通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²(3)2mn/4m²— 9与4m²n+6m/8m²—27急
(1)
6c/a²b=18bc/a²b²
c/3ab² =ac/3a²b²
(2)
x - y/2x+3y=(x-y)(x+y)²/(2x+3y)(x+y)²
xy/(x+y)²=xy(2x+3y)/(2x+3y)(x+y)²
(3)
2mn/4m²— 9=2mn(8m²-27)/(4m²-9)(8m²-27)
4m²n+6m/8m²—27=(4m²n+6m)(4m²-9)/(4m²-9)(8m²-27)
不要急,请核对你第二、三题的二个分母,我怀疑有错