Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
A = \(\frac{6x\left(1+8+27\right)}{6x\left(12+96+324\right)}\)= \(\frac{36}{432}\)=\(\frac{1}{12}\)
\(\dfrac{8}{9}:\dfrac{3}{7}=\dfrac{56}{27}\\ \dfrac{8}{9}+\dfrac{2}{5}=\dfrac{58}{45}\\ \dfrac{7}{8}-\dfrac{1}{3}=\dfrac{13}{24}\\ \dfrac{3}{10}\times\dfrac{1}{6}=\dfrac{1}{20}\\ 1\dfrac{2}{7}+6\dfrac{5}{6}=\dfrac{9}{7}+\dfrac{41}{6}=\dfrac{341}{42}\\ 5\dfrac{3}{4}-\dfrac{1}{5}=\dfrac{23}{4}-\dfrac{1}{5}=\dfrac{111}{20}\\ 6\dfrac{2}{9}:4\dfrac{7}{10}=\dfrac{56}{9}:\dfrac{47}{10}=\dfrac{560}{423}\\ \dfrac{5}{3}+\dfrac{3}{2}-\dfrac{7}{6}=2\)
Lời giải:
1.
$3\frac{1}{4}-2\frac{1}{3}=3+\frac{1}{4}-(2+\frac{1}{3})$
$=3-2+\frac{1}{4}-\frac{1}{3}$
$=1+\frac{1}{4}-\frac{1}{3}=\frac{5}{4}-\frac{1}{3}=\frac{11}{12}$
2.
$6\frac{5}{9}+2\frac{5}{6}=6+\frac{5}{9}+2+\frac{5}{6}=8+\frac{5}{6}+\frac{5}{9}=8+\frac{25}{18}=8+1+\frac{7}{18}=9+\frac{7}{18}=9\frac{7}{18}$
3.
$6\frac{5}{9}-2\frac{5}{6}=6+\frac{5}{9}-(2+\frac{5}{6})$
$=6+\frac{5}{9}-2-\frac{5}{6}$
$=(6-2)+\frac{5}{9}-\frac{5}{6}$
$=4+\frac{5}{9}-\frac{5}{6}=\frac{41}{9}-\frac{5}{6}=\frac{67}{8}$
2 + 2 + 2 = 6
3 x 3 - 3 = 6
5 : 5 + 5 = 6
6 + 6 - 6 = 6
7 - 7 : 7 = 6
(1+1+1)!=6
2+2+2=6
3x3-3=6
√4+√4+√4=6
5+(5:5)=6
6+6-6=6
7-(7:7)=6
√(8:8)+8=6
(9-9)+√9!
Mình sẽ trả lời từng câu một nhé:
x-6 1/2=6 1/3+6 1/6
x-13/2=19/3+37/6
x-13/2=38/6+37/6
x-13/2=75/6
x =75/6+13/2
x =75/6+39/6
x =19
x-3/7=1/2+3/7
x-3/7=7/14+6/14
x-3/7=13/14
x =13/14+3/7
x =13/14+6/14
x =19/14
x-3/5=1/3:1/6
x-3/5=1/3x6
x-3/5=2
x =2+3/5
x =10/5+3/5
x =13/5
x:3/2=5/6-3/8
x:3/2=40/48-18/48
x:3/2=11/24
x =11/24x3/2
x =3/16
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
Bài này dễ ợt
\(\left(1+1+1\right)!=6\)
\(2+2+2=6\)
\(3\times3-3=6\)
\(\sqrt{4}+\sqrt{4}+\sqrt{4}=6\)
\(5+5:5=6\)
\(6-6+6=6\)
\(7-7:7=6\)
\(\sqrt{\left(8+8:8\right)}!=6\)
\(\sqrt{9}\times\sqrt{9}-\sqrt{9}=6\)
\(\sqrt{\left(10-10:10\right)}!=6\)
2/2.4 + 2/4.6 + 2/6.8 + ... + 2/98.100
= 1/2 - 1/4 + 1/4 - 1/6 + 1/6 - 1/8 + ... + 1/98 - 1/100
= 1/2 + (-1/4 + 1/4) + (-1/6 + 1/6) + ... + (-1/98 + 1/98) - 1/100
= 1/2 - 1/100 = 49/100
em không được đăng các câu hỏi nháp trên diễn đàn nhé!
4