a,4-5/7 B,1/2 chia 3 C,266,22 chia 34 D,20,57* 416
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Tính:
a, 4 - \(\frac{5}{7}\)= \(\frac{23}{7}\)
b, 12 : 3 = 4
c, 578,97 x 307 = 177743,79
d, 266,22 : 34 =7,83
HOK TỐT
Bài 1 : Tính
a) 4 - 5/7 = .....23/7.............
b) 1/2 : 3 = ......1/6........................
c) 266,22 : 34 = ..............7,83............
d) 7/9 + 9/10 = ......151/90...................
e) 3 và 1/2 : 2 và 1/4 = .....14/9...........
g) 21,76 x 2,05 =....44,608......................
h) 75,95 : 3,5 = .........21,7...................
i) 5/6 + 7/12 = .......17/12...................
k) 3 - 5/7 = .....16/7...................
Bài 1 : Tính
a) 4 - 5/7 = 23/7.
b) 1/2 : 3 = 1/6.
c) 266,22 : 34 = 783/100
d) 7/9 + 9/10 = 151/90
e) 3 và 1/2 : 2 và 1/4 = 3
g) 21,76 nhân 2,05 =.5576/125
h) 75,95 : 3,5 = 217/10
i) 5/6 + 7/12 = 97/102
k) 3 - 5/7 = 16/7
`@` `\text {Ans}`
`\downarrow`
`a)`
\(\dfrac{3}{4}+\dfrac{2}{3}+\dfrac{3}{5}\)
`=`\(\dfrac{9}{12}+\dfrac{8}{12}+\dfrac{3}{5}\)
`=`\(\dfrac{17}{12}+\dfrac{3}{5}\)
`=`\(\dfrac{85}{60}+\dfrac{36}{60}\)
`=`\(\dfrac{121}{60}\)
`b)`
\(\dfrac{1}{2}\cdot\dfrac{9}{13}\div\dfrac{27}{26}\)
`=`\(\dfrac{1}{2}\cdot\dfrac{9}{13}\cdot\dfrac{26}{27}\)
`=`\(\dfrac{1}{2}\cdot\dfrac{2}{3}\)
`=`\(\dfrac{1}{3}\)
`c)`
\(\dfrac{2}{7}\cdot\dfrac{1}{9}+\dfrac{2}{7}\cdot\dfrac{2}{9}+\dfrac{1}{3}\cdot\dfrac{5}{7}\)
`=`\(\dfrac{2}{7}\cdot\left(\dfrac{1}{9}+\dfrac{2}{9}\right)+\dfrac{1}{3}\cdot\dfrac{5}{7}\)
`=`\(\dfrac{2}{7}\cdot\dfrac{1}{3}+\dfrac{1}{3}\cdot\dfrac{5}{7}\)
`=`\(\dfrac{1}{3}\cdot\left(\dfrac{2}{7}+\dfrac{5}{7}\right)\)
`=`\(\dfrac{1}{3}\cdot1=\dfrac{1}{3}\)
`d)`
\(11\div\dfrac{5}{2}+11\div\dfrac{7}{3}+11\div\dfrac{35}{6}\)
`=`\(11\cdot\dfrac{2}{5}+11\cdot\dfrac{3}{7}+11\cdot\dfrac{6}{35}\)
`=`\(11\cdot\left(\dfrac{2}{5}+\dfrac{3}{7}+\dfrac{6}{35}\right)\)
`=`\(11\cdot1=11\)
a) 3/4 + 2/3 + 3/5 = 45/60 + 40/60 + 36/60 = 121/60
b) 1/2 x 9/13 : 27/26 = 9/26 x 26/27 = 1/3
c) 2/7 x 1/9 + 2/7 x 2/9 + 1/3 x 5/7 = 2/7 x (1/9 + 2/9) + 5/21 = 2/7 x 1/3 + 5/21 = 2/21 + 5/21 = 1/3
d) 11 : 5/2 + 11 : 7:3 + 11 : 35/6 = 11 x (2/5 + 3/7 + 6/35) = 11 x 1 = 11
4-5/7=23/7
1/2:3=1/6
578,97x307=177743,79
266,22:34=7,83
4-5/7=28/5
1/2:3=1/6
578,97nhân307=177743.79
266,22:34=7.83
A = 8⁸ + 2²⁰
= (2³)⁸ + 2²⁰
= 2²⁴ + 2²⁰
= 2²⁰.(2⁴ + 1)
= 2²⁰.17 ⋮ 17
Vậy A ⋮ 17
a, \(4-\frac{5}{7}=\frac{28}{7}-\frac{5}{7}=\frac{23}{7}\)
b,\(\frac{1}{2}\div3=\frac{1}{2}\times\frac{1}{3}=\frac{1}{6}\)
c,\(266,22\div34=\frac{13311}{50}\times\frac{1}{34}=\frac{783}{100}\)
d,\(20,57\times416=8557,12\)