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प्रश्न
Add : 13ab − 9cd − xy, 5xy, 15cd − 7ab, 6xy − 3cd
उत्तर
(13ab − 9cd − xy) + (5xy) + (15cd - 7ab) + (6xy - 3cd)
= 13ab - 7ab - 9cd + 15cd - 3cd + (-xy + 5xy + 6xy)
= 6ab - 12cd + 15cd + 11xy - xy
= 6ab + 3cd + 10xy
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