(-2a)^6-(-3a^3)^2-[-(1/2a)^2]^3*(-2)^7=?
问题描述:
(-2a)^6-(-3a^3)^2-[-(1/2a)^2]^3*(-2)^7=?
答
(-2a)^6-(-3a^3)^2-[-(1/2a)^2]^3*(-2)^7
=a^6[2^6-3^2-(-2)^7 *(-1/2)^3]
=a^6(64-9-2^4)
=a^6(55-16)
=39a^6那么请问知不知道:1/8(x+1)^5=a5*x^5+a4*x^4+a3*x^3+a2*x^2+a1*x^+a0,求2^a0*4^a1*2^a2*4^a3*2^a4*4我会给20分这个是多项式展开吧a5=1/8* C(5,5)=1/8a4 = 1/8 * C(5,4)=5/8a3 = 1/8 * C(5,3)=5/4a2= 1/8 * C(5,2)=5/4a1= 1/8* C(5,1)=5/8a0=1/82^a0*4^a1*2^a2*4^a3*2^a4*4^A5(a5 你写掉了)=2^(1/8+2*5/8+5/4+2*5/4+5/8+2*1/8)=6(1/8+5/8+5/4)=6*2=12