chung minh rang tong cua 1 phan so duong voi so nghich dao cua no ko nho hon 2
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Chung minh rang tong cua mot phan so duong voi so nghich daocua no thi khong nho hon 2
tim 2 phan so co tu = 1, cac mau duong, biet rang tong cua 2 phan so ay cong voi tich cua chung = 1/2
tu cua mot phan so nho hon mau cua no la 50 don vi. neu them vao tu 17 don vi , vao mau 2 don vi thi duoc phan so moi bang nghich dao cua phan so ban dau. tim phan so ban dau
cho 2 phan so co tong bang 2015 lan tich cua chung
tinh tong cac phan so nghich dao cua chung
x+y = 2015xy =>( x+y}/xy = 2015
1/x + 1/y = ( x+y)/xy = 2010
nghich dao 2 so la 2015
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chung to rang tong cua 3 phan so sau nho hon 2 :A=10/27 ,9/16,11/24
cong vao hoac chia 2 thanh 3 phan sao cho cac phan do lon hon cac so de cho
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tim 3 phan so toi gian biet tong cua chung bang 269/30.Tu so cua chung ti le thuan voi 5,7,11. Mau so cua chung ti le nghich voi 1/4; 1/5;1/6
Giup minh nhe
Khong tinh tong cua 3 phan so sau, hay chung to rang tong do nho hon 2:
A = 11/29 + 9/17 + 10/19
Khong tinh tong cua ba phan so sau, hay chung to rang tong do nho hon 2:
A= 11/ 29+ 9/ 17 + 10/ 19
tim 2 so nguyen duong sao cho tong nghich dao cua chung bang 2