(1)
2^-5+(1/2)^-4+2^-1*2^-3*2+1
=1/32+16+1/2*1/8*2+1
=17+5/32
=549/32
(2)
由y^2m-1÷y=y^2得
y^(2m-2)=y^2
所以2m-2=2
所以m=2
(3)
因为
2*10^-7=2/10*10^-6=(10^-6)/52*10^-7
(1)
2^-5+(1/2)^-4+2^-1*2^-3*2+1
=1/32+16+1/2*1/8*2+1
=17+5/32
=549/32
(2)
由y^2m-1÷y=y^2得
y^(2m-2)=y^2
所以2m-2=2
所以m=2
(3)
因为
2*10^-7=2/10*10^-6=(10^-6)/52*10^-7