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a.\(\dfrac{18}{15}+\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{18+7+12}{15}=\dfrac{37}{15}\)
b.\(\dfrac{9}{7}+\dfrac{8}{7}+\dfrac{11}{7}=\dfrac{9+8+11}{7}=\dfrac{28}{7}=4\)
a,18/15+7/15+12/15=18+7+12/15
=37/15
b,9/7+8/7+11/7=9+8+11/7
=28/7=1/4
+8/15 + 7/15 +12/15 = (18+7+12)/7 = [(18+12)+7]/15= (30+7)/15=37/15=7/3
9/7 + 8/7 + 11/7 = (9+8+11)/7= [(9+11)+8]/7=(20+8)/7= 28/7 =4
\(\frac{7}{15}+\frac{9}{16}+\frac{8}{15}+\frac{7}{16}\)
\(=\left(\frac{7}{15}+\frac{8}{15}\right)+\left(\frac{9}{16}+\frac{7}{16}\right)\)
\(=\frac{15}{15}+\frac{16}{16}\)
\(=1+1\)
\(=2\)
Bài làm
\(\frac{7}{15}x\frac{3}{8}+\frac{7}{15}x\frac{5}{8}\)
= \(\frac{7}{15}x\left(\frac{3}{8}+\frac{5}{8}\right)\)
= \(\frac{7}{15}x\frac{8}{8}\)
= \(\frac{7}{15}x1\)
= \(\frac{7}{15}\)
# Chúc bạn học tốt #
\(\frac{7}{15}\cdot\frac{3}{8}+\frac{7}{15}\cdot\frac{5}{8}\)
\(=\frac{7}{15}\cdot(\frac{3}{8}+\frac{5}{8})\)
\(=\frac{7}{15}\cdot1=\frac{7}{15}\)
a) \(\frac{18}{15}+\frac{7}{15}+\frac{12}{15}\)
= \(\frac{18+7+12}{15}\)
= \(\frac{37}{15}\)
b) \(\frac{9}{7}+\frac{8}{7}+\frac{11}{7}\)
= \(\frac{9+8+11}{7}\)
= \(\frac{28}{7}\)
a) 18/15 + 7/15 + 12/15
= (18/15 + 12/15) + 7/15
= 30/15 + 7/15
= 37/15
b) 9/7 + 8/7 + 11/7
= (9/7 + 11/7) + 8/7
= 20/7 + 8/7
= 28/7
chuc ban hok tot
a) 18/15 + 7/15 + 12/15 =18/15 + 12/15 + 7/15
= 30/15 + 7/15
= 37/15
b) 9/7 + 8/7 +11/7 = 9/7 + 11/7 + 8/7
= 20/7 + 8/7 = 28/7 nha . tk mk nhé b
11/15 + 8/5= Tính phân số
6/7 - 5/21=
25/4 x 16/100
7 x 2/49 =
4/3 : 2/9
5/8 : 25 =
8/15÷7=8/105
8/105 nhé