5 + 6 +7
1. Dãy phân số nào dưới đây được sắp xếp theo thứ tự từ bé đến lớn ?
A, 1; 7/5 ; 7/6 ; 5/7 ; 6/7
B, 5/7 ; 6/7 ; 7/6 ; 7/5 ; 1
C, 5/7 ; 6/7 ; 1 ; 7/6 ; 7/5
D, 5/7 ; 6/7 ; 7/6 7/5 ; 1
1+1+1+1+1+1+1+1+1+1+1+5+5+5+5+5+5+5x5x5x5+6+6+6+6+6+6+6+6+6+7+7+7+7+7+77=
Tính nhẩm:
6 x 6 = ..... 63 : 7 = ..... 7 x 5 = ....... 6 x 7 = .....
7 x 7 = ..... 48 : 6 = ..... 35 : 7 = ..... 42 : 6 = .....
5 x 5 = ..... 49 : 7 = ..... 35 : 5 = ..... 42 : 7 = .....
6 x 6 = 36 63 : 7 = 9 7 x 5 = 35 6 x 7 = 42
7 x 7 = 49 48 : 6 = 8 35 : 7 = 5 42 : 6 = 7
5 x 5 = 25 49 : 7 = 7 35 : 5 = 7 42 : 7 = 6
6 x 6 = .36.... 63 : 7 = 9..... 7 x 5 = .35...... 6 x 7 = ..42...
7 x 7 = ..42... 48 : 6 = ..8... 35 : 7 = ...5.. 42 : 6 = ..7...
5 x 5 = ...25.. 49 : 7 = .7.... 35 : 5 = ...7.. 42 : 7 = ..6...
hok tốt
>, <, = ?
3 + 4 … 6 | 6 + 1 … 6 | 5 + 1 … 6 |
3 + 4 … 7 | 5 + 2 … 6 | 7 – 5 … 3 |
7 – 4 … 4 | 7 – 2 … 5 | 7 – 6 … 1 |
Lời giải chi tiết:
3 + 4 > 6 | 6 + 1 > 6 | 5 + 1 = 6 |
3 + 4 = 7 | 5 + 2 > 6 | 7 – 5 > 3 |
7 – 4 < 4 | 7 – 2 = 5 | 7 – 6 = 1 |
(4+5)*(4+5+6)*(4+5+6+7)*. . . *(4+5+6+...+91)/5*(5+6)*(5+6+7)*...*(5+6+7+...+91)
a) 6/7 : ( 2/5 . 6/7)
b) 6/7 + 5/7 : 5 - 8/9
c) 6/7 + 5/8 . 1/5 - 3/16 . 4
d) -1/6 + 2/3 . -3/4 + 4/5
a: \(\dfrac{6}{7}:\left(\dfrac{2}{5}\cdot\dfrac{6}{7}\right)\)
\(=\dfrac{6}{7}:\dfrac{12}{35}\)
\(=\dfrac{6}{7}\cdot\dfrac{35}{12}=\dfrac{6}{12}\cdot\dfrac{35}{7}=\dfrac{5}{2}\)
b: \(\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}\)
\(=\dfrac{6}{7}+\dfrac{1}{7}-\dfrac{8}{9}\)
\(=1-\dfrac{8}{9}=\dfrac{1}{9}\)
c: \(\dfrac{6}{7}+\dfrac{5}{8}\cdot\dfrac{1}{5}-\dfrac{3}{16}\cdot4\)
\(=\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{4}\)
\(=\dfrac{48+7-42}{56}=\dfrac{13}{56}\)
d: \(\dfrac{-1}{6}+\dfrac{2}{3}\cdot\dfrac{-3}{4}+\dfrac{4}{5}\)
\(=-\dfrac{1}{6}-\dfrac{1}{2}+\dfrac{4}{5}\)
\(=\dfrac{-5-15+24}{30}=\dfrac{4}{30}=\dfrac{2}{15}\)
a.(3^5.3^7):3^10+5.2^4-7^3:7
b.3^2[(5^2-3):11]-2^4+2.10^3
c.(6^2007-6^2006):6^2006
d.(5^2001-5^2000):5^2000
e.(7^2005+7^2004):7^2004
f.(5^7+7^5).(6^8+8^6).(2^4-4^2)
g.(7^5+7^9).(5^4+5^6).(3^3.3-9^2)
h.[(5^2.2^3-7^2.2):2].6-7.2^5
mng giúp e vs e c.ơn
9+2+5+3+7+8+4+7+4+7+2+4+2+9+6+4+65+6+7+4+6+4+6+3+7+4+8+5+9+08+87+1+2+3+4+2+3+2+5+6+767+5+75+6+4+6+5+66+5+7+546+46+43+6+3+6+4+6+7+8878+68+68+6+7+9+9
\(9+2+5+3+7+8+4+2+9+6+4+65+6+7+4+6+3+7+4+8+5+9+08+87+1+2+3+4+2+3+2+5+6+767+5+75+6+4+6+5+66+5+7+546+46+43+6+3+6+4+6+7+8878+68+68+6+7+9+9=10961\)
A = 4/5 - 5/6 + 6/7 - 7/8 + 8/9 - 4/5 + 7/8 - 6/7 +5/6 - 6/7 +5/6
Ai Giải gium thì tui cảm ơn
A = 4/5 - 5/6 + 6/7 - 7/8 + 8/9 - 4/5 + 7/8 - 6/7 +5/6 - 6/7 +5/6
A =( 5/6 - 5/6+ 5/6 )+( 6/7 - 6/7 - 6/7 ) + (- 7/8 + 7/8) + 8/9 + (- 4/5 + 4/5)
A = - 5/6 - 6/7 + 0 +8/9 + 0
A = -0.80158730158
bạn tự đổi ra phân số nha !!!