September 2018 1 68 Report
Realiza las siguientes sumas
a. (5ײ+7×+8)+(3×+9)
b. (4m²-2mn-5n)+6m²+7mn)
c. (-9a³b²+7a²b-6)+(12a³b²-9a²b-5)
d. (-15×y²+8ײy-9×)+(-18ײy-3×+6)
Les agradecería si me ayudan con esto que no entiendo gracias
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