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प्रश्न
Add: -7mn + 5, 12mn + 2, 9mn - 8, -2mn - 3
उत्तर
(-7mn + 5) + (12mn + 2) + (9mn - 8) + (-2mn - 3)
= -7mn + 5 + 12mn + 2 + 9mn - 8 − 2mn - 3
= -7mn + 12mn + 9mn - 2mn + 5 + 2 - 8 - 3
= mn (-7 + 12 + 9 - 2) + (5 + 2 - 8 - 3)
= 12mn - 4
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