求不定积分1 (z-i 2)(z 2)dz c: IzI=1

z1=1-2i,1/z1=1/(1-2i)=(1+2i)/5z2=3+4i,1/z2=1/(3+4i)=(3-4i)/251/z=1/z1+1/z2=(1+2i)/5+(3-4i)/25=(5+10i

√5i,z2=1-√3i,z=4z1^4/3z2

1/z=(z1+z2)/(z1z2)z=(5+10i)(3-4i)/(5+10i+3-4i)=(15+40-20i+30i)/(8+6i)=(55-10i)(8-6i)/(8+6i)(8-6i)=5(

1/(1-2i)+1/(3+4i)=(1+2i)/5+(3-4i)/25=(8+6i)/25所以z=25/(8+6i)=25(8-6i)/100=2-(3/2)i

解1由题知z1,z2为共轭复数又由z1+z2=2解得z1,z2的实部为1又由丨z1丨=根号2,知z1的虚部为±1故z1=1+i,z2=1-i或z1=1-i,z2=1+i2由z1+z1=2z1z2=2构

1)若Z⒉+2|Z|=a(a≥0)求复数Z|Z|和a都是实数,所以Z是实数,Z=a/42)若复数Z满足|Z|=|Z+2+2i|,则|Z-1+2i|的最小值是________|Z-0|=|Z-(-2-2

x2+y2=1,y2+z2=2,z2+x2=2三式相加,可得x²+y²+z²=(1+2+2)/2=5x²+y²+z²+(xy+yz+zx)=

∵(x+y+z)(x²+y²+z²)=x³+y³+z³+x²(y+z)+y²(x+z)+z²(x+y)∴1*2

设z2=x+yiz1*z2=(1+3i)(x+yi)=x-3y+(3x+y)i+为纯虚数,则x=3yz2=3y+yi|z2|=y√10|(z+2i)|=2√2|z2/(z+2i)|=y√10/(2√2

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∵z=-1-i2=22-22i∴z2=12-2×22×22i+（22i）2=-i，可得z4=-1根据复数乘方的含义，可得z100=（z4）25=-1，z50=（z4）12•z2=-i∴z100+z50

（1）z1=-2√3-2iz2=-1+√3iz=z1/z2=(-2√3-2i)/(-1+√3i)上下同乘以(-1-√3i)得:z=(-2√3-2i)*(-1-√3i)/(1+3)=8i/4=2iz=2

1/z=1/(5+10i)+1/(3-4i)=(3-4i+5+10i)/(5+10i)(3-4i)=(8+6i)/(15-20i+30i+40)=(8+6i)/(55+10i)z=(55+10i)/(

设y=biz2=bi+(2-bi)i=b+(2+b)iz1=z2(2x+1)+i=b+(2+b)i所以2x+1=b1=2+bb=-1x=-1z1=-1+iz2=z1=-1+i-------------

1/z1=1/(5＋10i)=1/[5(1＋2i)]=(1/5)×[(1－2i)]/[(1＋2i)(1－2i)]=(1－2i)/251/z2=1/(3－4i)=(3＋4i)/[(3－4i)(3＋4i)

x/(y+z)+y/(z+x)+z/(x+y)=1所以x/(y+z)=1-[y/(z+x)+z/(x+y)]y/(z+x)=1-[x/(y+z)+z/(x+y)]z/(x+y)=1-[x/(y+z)+

等于0.x/(y+z)=1-[y/(z+x)+z/(x+y)]y/(z+x)=1-[x/(y+z)+z/(x+y)]z/(x+y)=1-[x/(y+z)+y/(z+x)]x2/(y+z)+y2/(z+

2分之13根号下2

x+y+z=1xy+yz+zx=21*2=(x+y+z)(xy+yz+zx)=x(xy+yz+zx)+y(xy+yz+zx)+z(xy+yz+zx)=x²y+xyz+zx²+xy&

∵|z|=1，∴z=cosθ+isinθ，∴|2z2-z+1|=|2（cosθ+isinθ）2-（cosθ+isinθ）+1|=|（2cos2θ-cosθ+1）+（2sin2θ-sinθ）i|=(2c