如果a和b互为倒数,那么：

1/a÷b/3=( )
1/b÷a/5=( )
a/4÷5/b=( )
b/2÷2/a=( )

如果a和b互为倒数，则ab=1
1/a÷b/3=3/(ab)=( 3 )
1/b÷a/5=5/(ab)=( 5 )
a/4÷5/b=ab/20=( 1/20 )
b/2÷2/a=ab/4=( 1/4 )

..

如果a,b互为倒数，那么a×b=1

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答案是： 3 5 1/20 1/4

(1/a) ÷ (b/3) = b ÷ (b/3) = (3) (1/b) ÷ (a/5) = a ÷ (a/5) = (5) (a/4) ÷ (5/b) = ( a/4) ÷ (5a) = (1/20) (b/2) ÷ (2/a) = (b/2)÷ (2b) = (1/4)

a²+b²=c²(a²+b²)-2(a²+b²)-8=c²-2c²-8=0c²=-8实数无解.