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2.
3. (7m²)³+3 (7m²)²6n³+3 7m² (6n³)²+ (6n³)³
342m6+ 3 (49m⁴) 6n³+ 3 7m² (36n6)+216n9
342m6+ 882m⁴n³+756m²n6+216n9
4.a²+8-56
5.16x²4-15+50
6.64a²b²4+49c²9