3/7 * 11/5 + 4/7 * 11/5
= 11/5 * (3/7+4/7)
= 11/5 * 7/7
= 11/5 * 1
= 11/5
\(\frac{3}{7}X\frac{11}{5}+\frac{4}{7}X\frac{11}{5}=\left(\frac{3}{7}+\frac{4}{7}\right)X\frac{11}{5}=1X\frac{11}{5}=\frac{11}{5}\)
3/7 * 11/5 + 4/7 * 11/5
= 11/5 * (3/7+4/7)
= 11/5 * 7/7
= 11/5 * 1
= 11/5
\(\frac{3}{7}X\frac{11}{5}+\frac{4}{7}X\frac{11}{5}=\left(\frac{3}{7}+\frac{4}{7}\right)X\frac{11}{5}=1X\frac{11}{5}=\frac{11}{5}\)
3 x ( 1/7 + 1/3 - 3/14 ) : 11/14
( 8/5 + 11/5 ) x 11/10 + ( 17/10 - 4/5) : 3/7
1.Tính
\(a,5\text{x}\dfrac{7}{3}\) \(b,\dfrac{13}{4}:7\)
2.Tính
\(a,\dfrac{3}{7}+\dfrac{2}{5}+\dfrac{3}{4}\) \(b,\dfrac{9}{7}-\dfrac{5}{11}\text{x}\dfrac{11}{7}\) \(c,\dfrac{3}{5}\text{x}\dfrac{5}{7}\text{+}\dfrac{4}{7}\) \(d,\dfrac{7}{9}\text{x}\dfrac{2}{5}:\dfrac{3}{11}\) e,\(\dfrac{9}{7}+\dfrac{2}{3}-\dfrac{1}{4}\)
g,\(\dfrac{4}{9}:\dfrac{3}{5}\text{x}\dfrac{2}{11}\) h,\(\dfrac{7}{2}-\dfrac{3}{10}:\dfrac{2}{5}\)
Tính giá trị biểu thức:
(\(\dfrac{6}{11}+\dfrac{5}{11}\)) x \(\dfrac{3}{7}\) \(\dfrac{3}{5}x\dfrac{7}{9}-\dfrac{3}{5}x\dfrac{2}{9}\) \(\left(\dfrac{6}{7}-\dfrac{4}{7}\right):\dfrac{2}{5}\)
Tính bằng cách thuận tiện nhất:
a) 16, 2 x 3, 7 + 5, 7 x 16, 2 - 7, 8 x 4, 8 - 4, 6 x 7, 8 : 11, 2 + 12, 3 + 13, 4 - 12, 6 - 11, 5 - 10, 4
4 tìm x :
a) x - 5/7 - 13/14 = 1
b) 3/5 + x + 11/5 = 11/3
Tìm x
a) 1/2 : 3 + x = 14/5
b) 8/5 : x : 7/4 = 11/6
c) 24/10 + x : 3/4 = 11/3
Tính hợp lí:
a) 5/7 + 3/8 + 5/8 + 2/7
b) 38/7 - (24/7 + 3/4)
c) 11/3 : (4/3 x 1/2)
d) (68/7 x 7/9) : 7/68
e) 13/4 : 5/6 + 11/4 : 5/6
f) 7/8 : 8/23 + 7/28 : 8/17
a.(x*2,4-4,2):x=1
b.1/1x3+1/3x5+1/5x7+...+1/x(x+2)
c.7/3+7/4-7/11 +5/7
5/3+5/9-5/11
5/7 + 3/14 = ?
11/12 - 5/6 = ?
6 x 5/18 = ?
4/5 : 3/7 = ?