已知a b=-4,ab=2,求根号b分之a 根号a分之b的值
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![已知a b=-4,ab=2,求根号b分之a 根号a分之b的值](/uploads/image/f/4210137-9-7.jpg?t=%E5%B7%B2%E7%9F%A5a+b%3D-4%2Cab%3D2%2C%E6%B1%82%E6%A0%B9%E5%8F%B7b%E5%88%86%E4%B9%8Ba+%E6%A0%B9%E5%8F%B7a%E5%88%86%E4%B9%8Bb%E7%9A%84%E5%80%BC)
1.BC=12AB=12*4=48cmAD=AB=4cmCD=AD+AB+BC=56cm2.AE=1/2AD=2cmBE=1/2BC=24cmEF=AE+AB+BF=2+4+24=30cm
AB=4CMBC=2AB=8CMAC=AB+BC=12CMPC=AC/2=6CMPB=BC-PC=8-6=2CM
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ab(a^2b^5-ab^3-b)=a^3b^6-a^2b^4-ab^2=(ab^2)^3-(ab^2)^2-ab^2=6³-6²-6=216-36-6=174
2a+3ab+2b=2a+2b+3ab=2(a+b)+3ab=2*4+3*1=11a³-a²b+a²b²+a²b-a²b²+b
(3a-4b-ab)-(a-2b+3ab)=3a-4b-ab-a+2b-3ab=2a-2b-4ab=2(a-b)-4ab=2×(-1)-4×(-2)(将a-b=-1,ab=-2代入)=-2+8=6
ab^2=-2-ab(a^2b^5-ab^3-b)=-a^3b^6+a^2b^4+ab^2=-(ab^2)^3+(ab^2)^2+ab^2=-(-2)^3+(-2)^2+(-2)=8+4-2=10
(x+2)(x+3)=-4无解,化开得(x+5/2)^2+13/4=0(x^2)/6-0.5x-1/3=0,两边同乘6,x^2-3x-2=0(x-1)(x-2)=0,x=1或x=2根号3)x^2-x+
a2+2ab+b2=(a2+ab)+(ab+b2)=-2+6=4
ab^2=-6所以-ab(a^2*b^5-ab^3-b)=-a^3b^6+a^2b^4+ab^2=-(ab^2)^3+(ab^2)^2+(ab^2)=-(-6)^3+(-6)^2+(-6)=216+3
ab(36b-6b-b)=29ab^2=(30-1)*6=174
ab(ab^3+a^2b^5-b)=ab²(ab²+a²b^4-1)=6*(6+6²-1)=6*41=246
设较长的线段AC的长为x,则AC2=AB•BC,即x2=1•(1-x),解得x1=5−12,x2=−5−12(舍去)∴ACAB=5−12.
明显a=2b=-1,代入.
2(ab-3a)-3(2b-ab)=2ab-6a-6b+3ab=5ab-6(a+b)=5*(-5)-6*(-4)=-25+24=-1
2(ab-3a)-3(2b-ab)=2ab-6a-6b+3ab=5ab-6(a+b)=3×2-6×4=-18
a^2+3ab+2b^2=(a^2+ab)+2X(ab+b^2)=4-2=2
求AE?线段AB=4cm延长线段AB到C,BC=1cm,AD=3cm,E是AD中点,AE=1.5F是CD的中点CF=(3+4+1)/2=4AF=1EF=1.5+1=2.5EF=2.5cm或者是:因为:
(ab)^4*(a^2b)^2*(b^5)^2=a^4*b^4*a^4*b^2*b^10=a^8*b^16=(ab^2)^8=2^8=256