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1 + 9 = 10
2 + 8 = 10
3 + 7 = 10
4 + 6 = 10
Có thể lập tất cả: 1/9 ; 2/8 ; 3/7 ; 4/6
số bé nhất có 2 chữ số : 10
số lớn nhất có 2 chữ số : 99
(99-10)+1 = 90 số
(90-28) = 62 số có 2 chữ số và mẫu hơn tử số 28 đơn vị
Vì phân số đó lớn hơn 1 nên mẫu số phải lớn hơn 29 vì 29/29 = 1 . Vậy dãy các phân số đó là : \(\frac{30}{29};\frac{31}{29};....;\frac{98}{29};\frac{99}{29}.\)
Nên số phân số có được trong dãy là : ( 99 - 30 ) : 1 + 1 = 70 ( số )
Đáp số : 70 số .
mẫu số là :
( 25 + 7 ) : 2 = 16
tử số là :
25 - 16 = 9
đáp số : \(\frac{9}{16}\)
dễ quá
toán lớp 4 sao khó z ta
mik lớp 5 rùi nhưng đay là toán nâng cao huhuhuhu
1/23;1/22;1/21....