4乘以（-4分之3）的2n次方乘以8的m次方乘以（1又3分之1）的2n次方乘以（0.125）的m次方+8的n次方除以4 的n次方
=4×(-3/4)²ⁿ×8^m×(4/3)²ⁿ×(1/8)^m+8ⁿ÷4ⁿ
=4×(-3/4×4/3)²ⁿ×(8×1/8)^m+(2×4)ⁿ÷4ⁿ
=4×(-1)²ⁿ×1^m+2ⁿ×4ⁿ÷4ⁿ
=4+2ⁿ