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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]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
4/6 + 9/15 = 2/3 + 3/5 = 10/15 + 9/15 = 19/15
12/48 + 25/30 = 1/4 + 5/6 = 6/24 + 20/24 = 26/24 = 13/12
6/8 + 4 = 3/4 + 16/4 = 19/4
28/32 - 45/72 = 7/8 - 5/8 = 2/8 = 1/4
8/28 - 5/30 = 4/7 - 1/6 = 24/42 - 7/42 = 17/42
5 - 10/4 = 10/2 - 5/2 = 5/2
a). = \(\frac{2}{3}\)+ \(\frac{3}{5}\)= \(\frac{10}{15}\)+ \(\frac{9}{15}\)= \(\frac{19}{15}\)
b). = \(\frac{1}{4}\)+\(\frac{5}{6}\)= \(\frac{6}{24}\)+\(\frac{20}{24}\)= \(\frac{26}{24}\)=\(\frac{13}{12}\)
c). = \(\frac{3}{4}\)+ 4 = \(\frac{3}{4}\)+ \(\frac{4}{1}\)= \(\frac{3}{4}\)+ \(\frac{16}{4}\)= \(\frac{19}{4}\)
d). = \(\frac{7}{8}\)- \(\frac{5}{8}\)= \(\frac{7-5}{8}\)= \(\frac{2}{8}\)= \(\frac{1}{4}\)
e). = \(\frac{4}{7}\)- \(\frac{1}{6}\)= \(\frac{24}{42}\)- \(\frac{7}{42}\)= \(\frac{17}{42}\)
g). = \(\frac{5}{1}\)- \(\frac{10}{4}\)= \(\frac{20}{4}\)-\(\frac{10}{4}\)= \(\frac{10}{4}\)= \(\frac{5}{2}\)
cái mik để cách là để bạn tự viết đề bài vào, chúc bạn học tốt
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
\(\frac{3}{9}+\frac{9}{15}+\frac{8}{12}=\frac{1}{3}+\frac{3}{5}+\frac{2}{3}=\left(\frac{1}{3}+\frac{2}{3}\right)+\frac{3}{5}=1+\frac{3}{5}=\frac{8}{5}\)
\(\frac{4}{10}+\frac{12}{32}+\frac{9}{15}=\frac{2}{5}+\frac{3}{8}+\frac{3}{5}=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{3}{8}=1+\frac{3}{8}=\frac{11}{8}\)
\(\left(\frac{4}{10}-\frac{8}{30}\right)\times\frac{6}{8}=\frac{2}{15}\times\frac{3}{4}=\frac{6}{60}=\frac{1}{10}\)
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
\(a,\dfrac{2}{5}+\dfrac{3}{5}=\dfrac{5}{5}=1\\ b,\dfrac{1}{3}+\dfrac{2}{3}=\dfrac{3}{3}=1\\ c,\dfrac{7}{8}+\dfrac{5}{8}=\dfrac{12}{8}=\dfrac{3}{2}\\ d,\dfrac{1}{7}+\dfrac{3}{7}=\dfrac{4}{7}\)
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)\(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{12+7}{42}=\frac{19}{42}\)
:vv mik bik á nhưng hok bik trình bày như nào cho bn xem