Question

已知单项式3/4x^3y^a是同类项

已知-3y^a+2×x^2与4x^3-b×y^3是同类项,已知--4y^a+3乘x^3与4x^3-b 乘y^4是同类项,
求代数式3b^3－6a^2b－4b^3+5ba^2－2的值.
已知-3y^a+2×x^2与4x^3-b×y^3是同类项
发错了哈。后面的不管它

Answer 1

-3y^a+2×x^2与4x^3-b×y^3是同类项
则a+2=3,3-b=2
解得a= 1,b=1
故 3b^3－6a^2b－4b^3+5ba^2－2
= 3×1^3 - 6×1^2×1 - 4×1^3 +5×1×1^2 -2
= 3 -6 - 4 + 5 -2
= -4