Đáp án:
`Azzuri#`
`A=40/31.39+35/39.46+30/46.52+25/52.57`
`=>A=5.8/31.39+5.7/39.46+5.6/46.52+5.5/52.57`
`=>A=5(8/31.39+7/39.46+6/46.52+5/52.57)`
`=>A=5(1/31-1/39+1/39-1/46+1/46-1/52+1/52-1/57)`
`=>A=5(1/31-1/57)`
`=>A=5.26/31.57`
`B=31/19.31+65/19.43+39/23.43+143/69.19`
`=>B=13/19(7/31+5/43)+13/23(3/43+11/57)`
`=>B=13.(24/31.19+28/43.57)`
`=>B=13.52/57`
`=>` Tỉ số `A/B` là:
`(5.26/31.57)/(13.52/57)=5/62`
Giải thích các bước giải:
