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细心点,3个题目有2个有错误
1.共有(33-1)/2+1=17项, 等比数列,q=i²=-1
S=i(1-(i²)^17)/(1-i²)=i(1-(-1)^17)/(1-(-1))=i
2.z²=[(1-i)/√2]²=(1-2i+i²)/2=-i
i²=-1,(i²)²=i^4=(-1)²=1
z^50=(z²)^25=(-i)^25=-i^25=-(i^4)^6*i=-i
z^100=(z^50)²=(-i)²=-1
z^100+z^50+1=-1-i+1=-i
3.(-1+√3i)²=3i²-2√3i+1=-3-2√3i+1=-2-2√3i=-2(1+√3i)
(-1+√3i)^3=(-1+√3i)²(-1+√3i)=-2(√3i+1)(√3i-1)=-2(3i²-1)=-2(-3-1)=8
(1+i)²=1+2i+i²=1+2i-1=2i
(1+i)^6=[(1+i)²]^3=(2i)^3=8i^3=-8i
原式=8/(-8i)-(i+2)(1-2i)/[(1+2i)(1-2i)]
=-i/i²+(i-2i²+2-4i)/(1-4i²)
=i+(4-3i)/5
=2(2+i)/5
1.共有(33-1)/2+1=17项, 等比数列,q=i²=-1
S=i(1-(i²)^17)/(1-i²)=i(1-(-1)^17)/(1-(-1))=i
2.z²=[(1-i)/√2]²=(1-2i+i²)/2=-i
i²=-1,(i²)²=i^4=(-1)²=1
z^50=(z²)^25=(-i)^25=-i^25=-(i^4)^6*i=-i
z^100=(z^50)²=(-i)²=-1
z^100+z^50+1=-1-i+1=-i
3.(-1+√3i)²=3i²-2√3i+1=-3-2√3i+1=-2-2√3i=-2(1+√3i)
(-1+√3i)^3=(-1+√3i)²(-1+√3i)=-2(√3i+1)(√3i-1)=-2(3i²-1)=-2(-3-1)=8
(1+i)²=1+2i+i²=1+2i-1=2i
(1+i)^6=[(1+i)²]^3=(2i)^3=8i^3=-8i
原式=8/(-8i)-(i+2)(1-2i)/[(1+2i)(1-2i)]
=-i/i²+(i-2i²+2-4i)/(1-4i²)
=i+(4-3i)/5
=2(2+i)/5
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追答
第一题, i+33 是什么意思?
第三题 (+i)^6是什么意思?
不就是错了二个!!!
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