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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
a) 2/5+9/5=11/5
b) 15/45+25/30=7/6
c) 28/32+45/72=3/2
d) 8/28+5/30=19/42
bài 2
a) x - 4/5 =4/5 + (3/7+3/5)
x-4/5=4/5+36/35
x-4/5=64/35
x=64/35+4/5
x=92/35
b) x-7/35=4/5
x=4/5+7/35
x=1
nhớ tk m nhé
a = 18/5
b = 3/9 + 5/6 = 6/18 + 25/18 = 31/18
c = 7/8 + 5/8 = 12/8
d = 4/14 + 1/6 = 14/42 + 7/42 = 21/42 -= 7/14
b2
x - 4/5 = 4.5 + ( 3/7 + 3/5 )
x - 4/5 = 49/35
x = 49/35 + 4/5
x = 77/35
x - 7/35 = 4/5
x = 4/5 + 7/35
x = 1
mình ko chắc chắn đâu
mình nghĩ mình làm sai
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)\(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{12+7}{42}=\frac{19}{42}\)
a: =2/5+3/5=1
b: =1/3+2/3=1
c: =7/8+5/8=12/8=3/2
d: =2/7+3/7=5/7
\(a,\dfrac{2}{5}+\dfrac{3}{5}=\dfrac{5}{5}=1\\ b,\dfrac{1}{3}+\dfrac{2}{3}=\dfrac{3}{3}=1\\ c,\dfrac{7}{8}+\dfrac{5}{8}=\dfrac{12}{8}=\dfrac{3}{2}\\ d,\dfrac{1}{7}+\dfrac{3}{7}=\dfrac{4}{7}\)
mn ơi e vít nhầm là tính rồi rút gọn mn sửa lại là rút gọn rùi tính
bn ơi mk vít nhầm là tính rồi rút gọn bn sửa lại là rút gọn rùi tính
a)25/50 + 5/15 = 1/2 + 1/3 = 5/6
b)72/90 + 7/28 = 4/5 + 1/4 =\(1\frac{1}{20}\)
c)32/96 + 8/28 = 1/3 + 2/7 = 13/21
Chúc bạn tết vui vẻ nha!
\(\frac{25}{50}+\frac{5}{15}=\frac{1}{2}+\frac{1}{3}=\frac{3}{6}+\frac{2}{6}=\frac{5}{6}\)
\(\frac{72}{90}+\frac{7}{28}=\frac{8}{10}+\frac{1}{4}=\frac{32}{40}+\frac{10}{40}=\frac{42}{40}=\frac{21}{20}\)
\(\frac{32}{96}+\frac{8}{28}=\frac{1}{3}+\frac{2}{7}=\frac{7}{21}+\frac{6}{21}=\frac{13}{21}\)
a, \(\frac{25}{50}\)= \(\frac{25:25}{50:25}\)= \(\frac{1}{2}\) \(\frac{5}{15}\)= \(\frac{5:5}{15:5}\)= \(\frac{1}{3}\)
\(\frac{1}{2}\)+ \(\frac{1}{3}\)= \(\frac{3}{6}\)+ \(\frac{2}{6}\)= \(\frac{5}{6}\)
b, \(\frac{72}{90}\)= \(\frac{72:18}{90:18}\)= \(\frac{4}{5}\) \(\frac{7}{28}\)= \(\frac{7:7}{28:7}\)= \(\frac{1}{4}\)
\(\frac{4}{5}\)+ \(\frac{1}{4}\) = \(\frac{16}{20}\)+ \(\frac{5}{20}\)= \(\frac{21}{20}\)
c, \(\frac{32}{96}\)= \(\frac{32:32}{96:32}\)= \(\frac{1}{3}\) \(\frac{8}{28}\)= \(\frac{8:4}{28:4}\)= \(\frac{2}{7}\)
\(\frac{1}{3}\)+ \(\frac{2}{7}\) = \(\frac{7}{21}\)+ \(\frac{6}{21}\)= \(\frac{13}{21}\)
Lời giải và hướng dẫn:
a) 25/50 + 5/15 = 1/2 + 1/3 = 3/6 + 2/6 = 5/6.
b) 72/90 + 7/28 = 4/5 + 1/4 = 16/20 + 5/20 = 21/20.
c) 32/96 + 8/28 = 1/3 + 2/7 = 7/21 + 6/21 = 13/21.
A)\(\frac{25}{50}+\frac{5}{15}\)
\(=\frac{1}{2}+\frac{1}{3}\)
\(=\frac{3+2}{6}\)\(=\frac{5}{6}\)
B) \(\frac{72}{90}+\frac{7}{28}\)\(=\frac{4}{5}+\frac{1}{4}\)\(=\frac{16+5}{20}\)\(=\frac{21}{20}\)
C)\(\frac{32}{96}+\frac{8}{28}\)\(=\frac{1}{3}+\frac{2}{7}\)\(=\frac{7+6}{21}\)=\(\frac{13}{21}\)
NĂM MỚI VUI VẺ
a]27/45+25/15=3/5+5/3=34/15
b]28/32+45/72=7/8+5/8=12/8=3/2
c]8/28+5/30=2/7+1/6=19/42