Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)2/5+3/5 = 1
b)7/8+5/8 = 12/8= 3/2
c) 1/2+1/3 = 5/6
d) 2/7+1/6= 19/42
a, 2/5 + 9/15 28/32 + 45/72 b, 4/8 + 8/24 8/28 + 5/30
= 2/5 + 3/5 = 7/8 + 5/8 = 1/2 + 1/3 = 2/7 + 1/6
= 1. = 3/2. = 5/6. = 19/42.
k cho mik nha !
c)(145x99+145)-(143x102-143)
= 145x(99+1)-143x(101-1)
= 145x100-143x100
= (145-143)x100
= 2x100
= 200
a) \(\frac{2}{5}+\frac{9}{15}=\frac{2}{5}+\frac{3}{5}=\frac{5}{5}=1\)
b) \(\frac{15}{45}+\frac{25}{30}=\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{7}{6}\)
c) \(\frac{28}{32}+\frac{45}{72}=\frac{7}{8}+\frac{5}{8}=\frac{12}{8}=\frac{3}{2}\)
d) \(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{19}{42}\)
a) \(\frac{2}{5}+\frac{9}{15}\)=\(\frac{2}{5}+\frac{3}{5}=\frac{2+3}{5}=1\)
b)\(\frac{15}{45}+\frac{25}{30}=\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{2+5}{6}=\frac{7}{6}\)
c)\(\frac{28}{32}+\frac{45}{72}=\frac{7}{8}+\frac{5}{8}=\frac{7+5}{8}=\frac{12}{8}=\frac{3}{2}\)
d)\(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{12+7}{42}=\frac{19}{42}\)
15/45 + 25/30 = 1/3 + 5/6 = 2/6 + 5/6 = 7/6
28/32 + 45/72 = 7/8 + 5/8 = 12/8 rút gọn là 3/2
8/28 + 5/30 = 2/7 + 1/6 = 12/42 + 7/42 = 19/42
Tik nhaaaaa
326 x 28 + 326 x 72
= 326 x (28+72)
= 326 x 100
= 32 600
` 10000 – 47 xx 72 – 47 xx 28 `
`=10000-47xx(72+28)`
`=10000-47xx100`
`=100xx100-47xx100`
`=100xx(100-47)`
`=100xx53`
`=5300`
`10 000 - 47 xx 72 - 47xx28`
`=10 000 - 47 xx(72+28)`
`=10 000 - 47xx100`
`=10 000 - 4700`
`=5300`
Đáp án là B