Phương pháp giải:

Trừ nhẩm các số rồi điền kết quả vào chỗ trống.

Lời giải chi tiết:

a)

15 − 6 = 9         15 − 7 = 8

15 − 8 = 7         15 − 9 = 6

16 − 7 = 9         16 − 8 = 8

16 − 9 = 7         17 − 8 = 9

17 − 9 = 8         18 − 9 = 9

b)

18 − 8 − 1 = 9       18 − 9 = 9

15 − 5 − 2 = 8       15 − 7 = 8

16 − 6 − 3 = 7       16 − 9 = 7

15 - 6 = 9, 

15 - 8 =7, 

15 - 7 = 8, 

15 - 9 = 6

Phương pháp giải:

Tính nhẩm rồi điền kết quả vào chỗ trống.

Lời giải chi tiết:

a)

7 + 5 = 12        5 + 7 = 12

4 + 9 = 13        9 + 4 = 13

8 + 7 = 15        7 + 8 = 15

2 + 9 = 11        9 + 2 = 11

b)

16 − 8 = 8        14 − 7 = 7

11 − 9 = 2        17 − 9 = 8

12 − 5 = 7        16 − 9 = 7

13 − 6 = 7        15 − 8 = 7

7+5=17        5+7=17

4+9=13       9+4=13

Làm 1 câu

10/3...>...1/3

Mấy câu ssu tự quy đồng hay gì gì đấy!

10/3.>..1/3.     10/6.>..3/8.     17/4.>..5/6.    1/3..<.5/9     5/8.<..7/5    3/4..<.15/6      10/9.>..10/11   7/8..<.7/2       15/9.>..3/8  15/7.>..15/8      16/5.>..16/7    25/11..<.1

3.... + .....2 = 86 số thích hợp điền vảo chỗ chấm là

Giải chi tiết cho mình nha

\(\dfrac{2}{5}+\dfrac{11}{15}=\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)

\(\dfrac{7}{8}-\dfrac{7}{9}=\dfrac{63}{72}-\dfrac{56}{72}=\dfrac{7}{72}\)

\(\dfrac{11}{13}\times\dfrac{26}{31}=\dfrac{22}{31}\)

\(\dfrac{16}{24}:4=\dfrac{16}{24}\times\dfrac{1}{4}=\dfrac{4}{24}=\dfrac{1}{6}\)

\(30:\dfrac{6}{5}=30\times\dfrac{5}{6}=25\)

\(\dfrac{9}{16}:4=\dfrac{9}{16}\times\dfrac{1}{4}=\dfrac{9}{64}\)

\(\dfrac{1}{2}:\dfrac{1}{3}\times\dfrac{8}{15}=\dfrac{1}{2}\times3\times\dfrac{8}{15}=\dfrac{4}{5}\)

2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5

a: =-1+17/20=-3/20

b: =(28/60-33/60)*(-25/3)

=(-1/12)*(-25/3)=1/12*25/3=25/36

c: \(=\dfrac{1}{3}\cdot\dfrac{1}{3}=\dfrac{1}{9}\)

a 7/15 + (5/6 - 1/3) = 7/15 + 1/2 = 14/30 + 15/30 = 29/30

b 4/7 *21/16 : 5/8 = 3/4  : 5/8 = 6/5

c 15/8 - 4/9 * 6/8+ 1/6 =15/8 - 1/3 + 1/6 = 37/24 + 1/6 = 41/24

d 5/12+(3/4 + 2/3 ) : 34/3 =

a/\(\frac{7}{15}+\left(\frac{5}{6}-\frac{1}{3}\right)=\frac{7}{15}+\frac{1}{2}=\frac{29}{30}\)

b/\(\frac{4}{7}\cdot\frac{21}{16}:\frac{5}{8}=\frac{4}{7}\cdot\frac{2}{16}\cdot\frac{8}{5}=\frac{4}{35}\)

c/\(\frac{15}{8}-\frac{4}{9}\cdot\frac{6}{8}+\frac{1}{6}=\frac{15}{8}-\frac{1}{3}+\frac{1}{6}=\frac{41}{24}\)

d/ \(\frac{5}{12}+\left(\frac{3}{4}+\frac{2}{3}\right):\frac{34}{3}=\frac{5}{12}+\frac{17}{12}:\frac{34}{3}=\frac{5}{12}+\frac{1}{8}=\frac{13}{24}\)

a/   \(\frac{7}{15}+\left(\frac{5}{6}-\frac{1}{3}\right)\)

= \(\frac{7}{15}+\frac{1}{2}\)

= \(\frac{29}{30}\)

b/ \(\frac{4}{7}.\frac{21}{16}:\frac{5}{8}\)

= \(\frac{4}{7}.\frac{21}{16}.\frac{8}{5}\)

= \(\frac{6}{5}\)

c/ \(\frac{15}{8}-\frac{4}{9}.\frac{6}{8}+\frac{1}{6}\)

= \(\frac{15}{8}-\frac{1}{3}+\frac{1}{6}\)

= \(\frac{41}{24}\)

d/ \(\frac{5}{12}+\left(\frac{3}{4}+\frac{2}{3}\right):\frac{34}{3}\)

= \(\frac{5}{12}+\frac{17}{12}\)\(:\frac{34}{3}\)

= \(\frac{5}{12}+\frac{1}{8}\)

= \(\frac{13}{24}\)

#) Giải :

a) \(\frac{5}{6}\)x  \(\frac{6}{7}\)x  \(\frac{7}{8}\):  \(\frac{15}{16}\)=  \(\frac{5}{8}\):   \(\frac{15}{16}\)=  \(\frac{5}{8}\)x   \(\frac{16}{15}\)=  \(\frac{80}{120}\)=  \(\frac{4}{5}\)

b) \(\frac{4}{7}\)x  \(\frac{7}{10}\)x   \(\frac{3}{4}\) :  \(\frac{9}{20}\)=  \(\frac{2}{5}\)x   \(\frac{3}{4}\): \(\frac{9}{20}\)=  \(\frac{3}{10}\):  \(\frac{9}{20}\)=  \(\frac{60}{90}\)= \(\frac{2}{3}\)

#) Chúc bn học tốt :D

\(=\frac{5x6x7}{6x7x8}x\frac{16}{15}\\ =\frac{5}{8}x\frac{16}{15}\\ =\frac{2}{3}\)

b)\(=\frac{4x7x3}{7x10x4}x\frac{20}{9}\\ =\frac{3}{10}x\frac{20}{9}\\ =\frac{2}{3}\)

b)\(=\frac{4x7x3}{7x10x4}x\frac{20}{9}\\ =\frac{3}{10}x\frac{20}{9}\\ =\frac{2}{3}\)

\(\frac{5}{6}\times\frac{6}{7}\times\frac{7}{8}:\frac{15}{16}\)

\(=\frac{5}{6}\times\frac{6}{7}\times\frac{7}{8}\times\frac{16}{15}\)

\(=\frac{1}{1}\times\frac{1}{1}\times\frac{1}{1}\times\frac{2}{15}\)

\(=\frac{2}{15}\)

\(\frac{4}{7}\times\frac{7}{10}\times\frac{3}{4}:\frac{9}{20}\)

\(=\frac{4}{7}\times\frac{7}{10}\times\frac{3}{4}\times\frac{20}{9}\)

\(=\frac{4}{1}\times\frac{1}{10}\times\frac{1}{1}\times\frac{5}{3}\)

\(=\frac{4}{10}\times\frac{5}{3}\)

\(=\frac{4}{2}\times\frac{1}{3}\)

\(=\frac{4}{6}\)

\(=\frac{2}{3}\)