Tính hợp lý: -5/13 . 4/11 + -5/13 : 11/7+ 1 5/13
Giải thích
−513.411+−513:117+1513
=−513.411+−513.711+1813=−513.411+711+1813=−513.1111+1813=−513+1813=−5+1813=1313=1
−513.411+−513:117+1513
=−513.411+−513.711+1813=−513.411+711+1813=−513.1111+1813=−513+1813=−5+1813=1313=1