Đáp án:
`A = 5/6`
`B = 2/9`
`C = 35/96`
`D = 5/96`
Giải thích các bước giải:
`A = 3/7 × 5/6 + 5/6 × 4/7`
`A = 5/6 × (3/7 + 4/7)`
`A = 5/6 × 1`
`A = 5/6`
`B = 4/9 × 5/6 - 1/3 × 4/9`
`B = 4/9 × (5/6 - 1/3)`
`B = 4/9 × 1/2`
`B = 2/9`
`C = 1/6 ÷ 4/5 + 1/8 ÷ 4/5`
`C = 1/6 × 5/4 + 1/8 × 5/4`
`C = 5/4 × (1/6 + 1/8)`
`C = 5/4 × 7/24`
`C = 35/96`
`D = 1/6 ÷ 4/5 - 1/8 ÷ 4/5`
`D = 1/6 × 5/4 - 1/8 × 5/4`
`D = 5/4 × (1/6 - 1/8)`
`D = 5/4 × 1/24`
`D = 5/96`
Học tốt. Nocopy