(-x)^6-3x³·3x³-(-2x²)·(-2x²)·(-2x²)2x³·x³·x³-3x³·3x³·3x³+5x²·x^73a³·a^4+2a·a²·a^4-4a^5·(-a)²(6/7)²¹×(7/6)²³

(-x)^6-3x³·3x³-(-2x²)·(-2x²)·(-2x²)2x³·x³·x³-3x³·3x³·3x³+5x²·x^73a³·a^4+2a·a²·a^4-4a^5·(-a)²(6/7)²¹×(7/6)²³
(-x)^6-3x³·3x³-(-2x²)·(-2x²)·(-2x²)
2x³·x³·x³-3x³·3x³·3x³+5x²·x^7
3a³·a^4+2a·a²·a^4-4a^5·(-a)²
(6/7)²¹×(7/6)²³

(-x)^6-3x³·3x³-(-2x²)·(-2x²)·(-2x²)2x³·x³·x³-3x³·3x³·3x³+5x²·x^73a³·a^4+2a·a²·a^4-4a^5·(-a)²(6/7)²¹×(7/6)²³
(-x)^6-3x³·3x³-(-2x²)·(-2x²)·(-2x²)
=x^6-3x^6+8x^6
=6x^6
2x³·x³·x³-3x³·3x³·3x³+5x²·x^7
=2x^9-27x^9+5x^9
=-20x^9
3a³·a^4+2a·a²·a^4-4a^5·(-a)²
=3a^7+2a^7-4a^7
=a^7
(6/7)²¹×(7/6)²³
=(6/7×7/6)²¹×(7/6)²
=1²¹×(7/6)²
=49/36