Câu 1 : a , ( $\frac{4}{5}$ + $\frac{1}{2}$ ) × ( $\frac{3}{13}$ – $\frac{8}{13}$ ) b, 10/09/2021 Bởi Piper Câu 1 : a , ( $\frac{4}{5}$ + $\frac{1}{2}$ ) × ( $\frac{3}{13}$ – $\frac{8}{13}$ ) b,
`a, ( 4/5 + 1/2 ) . ( 3/13 – 8/13 )` `= ( 8/10 + 5/10 ) . ( – 5/13 )` `= 13/10 . ( – 5/13 )` `= -1/2` Bình luận
`a, ( 4/5 + 1/2 ) . ( 3/13 – 8/13 )`
`= ( 8/10 + 5/10 ) . ( – 5/13 )`
`= 13/10 . ( – 5/13 )`
`= -1/2`
Đáp án:
Giải thích các bước giải:
=(8\10+5\10)x-5\13
=13\10 x (-5)\13
=-1\2