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b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
=1x2x3x4x5x6x7x8x9
2x3x4x5x6x7x8x9x10
= 1
10
A) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)
B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)
C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)
D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)
B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)
C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)
D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)
Chúc bạn học tốt
a,2/5+7/10=11/10 b,6/7-5/8=13/56 c,3/5 x 15/8=9/8 d,1/4:3/7=7/12 HT
\(A.\frac{7}{8}-\frac{5}{12}=\frac{21}{24}-\frac{10}{24}=\frac{21-10}{24}=\frac{11}{24}\)
\(B.\frac{5}{6}-\frac{3}{10}=\frac{25}{30}-\frac{9}{30}=\frac{25-9}{30}=\frac{16}{30}=\frac{8}{15}\)
\(C.\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{8-6}{15}=\frac{2}{15}\)
\(D.\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{7-2}{10}=\frac{5}{10}=\frac{1}{2}\)
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a) 1 969, 1 970, 1 971, 1 972, 1 973, 1 974, 1 975.
b) 2, 4, 6, 8, 10, 12, 14.
c) 1, 3, 5, 7, 9, 11, 13, 15.
d) 5, 10, 15, 20, 25, 30, 35, 40.
3 x7/10 + 7/10x5 + 2 x 7/10
=( 3 + 5 + 2 ) x 7/10
= 10 x 7/10
= 7
Đáp án B