2/9 + 0,5 - 0,1 : 1/7
= 2/9 + 5/10 - 1/10 × 7/1
= 2/9 + 5/10 - 7/10
= 20/90 + 45/90 - 63/90
= 65/90 - 63/90
= 2/90
= 1/45
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2/9 + 0,5 - 0,1 : 1/7
= 2/9 + 5/10 - 1/10 × 7/1
= 2/9 + 5/10 - 7/10
= 20/90 + 45/90 - 63/90
= 65/90 - 63/90
= 2/90
= 1/45