1/7 + 1/8+1/9+ 1/10+ 1/12+ 1/14 + 1/15 + 1/18 + 1/22+ 1/24 + 1/28 + 1/33 TÍNH NHANH NHA 10/09/2021 Bởi Valerie 1/7 + 1/8+1/9+ 1/10+ 1/12+ 1/14 + 1/15 + 1/18 + 1/22+ 1/24 + 1/28 + 1/33 TÍNH NHANH NHA
Đáp án: 1 Giải thích các bước giải: ( 4/28 + 2/28 +1/28 ) +( 3/66 + 6/66 +2/66 ) + (3/30 + 2/30 ) +( 2/18 + 1/18 ) + ( 1/24 + 2/24+3/24) 7/28 + 11/66 + 5/30 + 3/18 +6/24 rút gọn 1/4 +1/6+1/6+1/6+1/4 1/4+1/4 +1/6+1/6+1/6 2/4 + 3/6 = 12/24+ 14/24 = 24/24 =1 Bình luận
$\frac{1}{7}+\frac{1}{8}+\frac{1}{9}+\frac{10}{10}+\frac{1}{12}+\frac{1}{14}+\frac{1}{15}+\frac{1}{18}+\frac{1}{22}+\frac{1}{24}+\frac{1}{28}+\frac{1}{33}\\=\frac{3960+3465+3080+2772+2310+1980+1848+1540+1260+1155+990+840}{27720}\\=\frac{25200}{27720}=\frac{10}{11}$ Bình luận
Đáp án: 1
Giải thích các bước giải: ( 4/28 + 2/28 +1/28 ) +( 3/66 + 6/66 +2/66 ) + (3/30 + 2/30 ) +( 2/18 + 1/18 ) + ( 1/24 + 2/24+3/24)
7/28 + 11/66 + 5/30 + 3/18 +6/24
rút gọn 1/4 +1/6+1/6+1/6+1/4
1/4+1/4 +1/6+1/6+1/6
2/4 + 3/6 = 12/24+ 14/24 = 24/24 =1
$\frac{1}{7}+\frac{1}{8}+\frac{1}{9}+\frac{10}{10}+\frac{1}{12}+\frac{1}{14}+\frac{1}{15}+\frac{1}{18}+\frac{1}{22}+\frac{1}{24}+\frac{1}{28}+\frac{1}{33}\\=\frac{3960+3465+3080+2772+2310+1980+1848+1540+1260+1155+990+840}{27720}\\=\frac{25200}{27720}=\frac{10}{11}$