Đáp án:
tính nhanh: `1+1/2+1/4+1/8+1/16+1/32`
=`2/2+1/2+1/4+1/8+1/16+1/32`
=`(2/2+1/2`)+`(1/4 + 1/32)`+`(1/8+1/16)`
=`3/2+`(8/32+1/32)`+`(2/16+1/16)`
=`3/2+9/32+3/16`
=`3/2+(9/32+3/16)`
=`3/2+(9/32+6/32)`
=`3/2+15/32`
=`48/32+15/32`
=`63/32`
#congquoc#