Chương I : Số hữu tỉ. Số thực
Các câu hỏi tương tự
a) 2/3 -4 . (1/2 +3/4)
b) (-1/3 + 5/6) .11 7
c) -5/11 . 7/15 . 11/-5 . (-30)
d) -1/6 . -15/19 . 38/45
e) -5/9 . 3/11 + ( -13/18 . 3/11)
f) ( 2 2/15 . 9/17 . 3/32) : -3/17
a) 2/3 -4 . (1/2 +3/4)
b) (-1/3 + 5/6) .11 -7
c) -5/11 . 7/15 . 11/-5 . (-30)
d) -1/6 . -15/19 . 38/45
e) -5/9 . 3/11 + ( -13/18 . 3/11)
f) ( 2 2/15 . 9/17 . 3/32) : -3/17
1) 5/7.37 13/23-51 13/23.5/72) -2/3 +1/3+0,5+2 1/23)-0,5+2/3+1/24) (8+2 1/3-3/5) -(5+0,4)-(3 1/2 -2)5) (2/9-7/12):3/4+(16/9-5/12):3/46) -(2021.0,7+19,75) +0,7- (8-19,75)7)15/34+7/21+19/34-20/158) 2 5/6+1/6:(-5/8)9) (-2)^2 +2/9. (4/5-2/3)10) (-1/5+3/7):5/4+(-4/5+4/7):5/411) 2022,2021 . 1954,1945+ 2022,2021 . (-1954,1945)12) -5,2 .72 +69,1 +5,2 . (-28)+(-1,1)13) (7 -1/2-3/4) : (5-1/4-5/8)14) (8+ 2 1/3 -3/5) -(5+0,4) -( 3 1/3 - 2)
Đọc tiếp
1) 5/7.37 13/23-51 13/23.5/7
2) -2/3 +1/3+0,5+2 1/2
3)-0,5+2/3+1/2
4) (8+2 1/3-3/5) -(5+0,4)-(3 1/2 -2)
5) (2/9-7/12):3/4+(16/9-5/12):3/4
6) -(2021.0,7+19,75) +0,7- (8-19,75)
7)15/34+7/21+19/34-20/15
8) 2 5/6+1/6:(-5/8)
9) (-2)^2 +2/9. (4/5-2/3)
10) (-1/5+3/7):5/4+(-4/5+4/7):5/4
11) 2022,2021 . 1954,1945+ 2022,2021 . (-1954,1945)
12) -5,2 .72 +69,1 +5,2 . (-28)+(-1,1)
13) (7 -1/2-3/4) : (5-1/4-5/8)
14) (8+ 2 1/3 -3/5) -(5+0,4) -( 3 1/3 - 2)
Tính 3/4-[(-3/5)-(1/12+2/9)-(-2/9-5/3)]
Bài 1: Tính
\(\dfrac{1}{2}-\left(\dfrac{-16}{17}\right)+\dfrac{4}{5}-\left(\dfrac{-4}{9}\right)+\dfrac{11}{45}+\dfrac{19}{34}+\dfrac{19}{105}\)
BT1: Tính nhanh:
1) \(\dfrac{1}{2}-\left(\dfrac{-16}{17}\right)+\dfrac{4}{5}-\left(\dfrac{-4}{9}\right)-\dfrac{11}{45}+\dfrac{19}{34}+\dfrac{19}{105}\)
\(\dfrac{3}{1^2.2^2}+\dfrac{5}{2^2.3^2}+\dfrac{7}{3^2.4^2}+....+\dfrac{19}{9^2.10^2}\)
Chứng minh rằng : \(A=\dfrac{3}{1^2.2^2}+\dfrac{5}{2^2.3^2}+\dfrac{7}{3^2.4^2}+...+\dfrac{19}{9^2.10^2}< 1\)
1, Tính giá trị của biểu thức N= \(\dfrac{9.5^{20}.27^9-3.9^{15}.25^9}{7.3^{29}.125^6-3.3^9.15^{19}}\)
2, Tìm 3 số a,b,c biết : \(\dfrac{3a-2b}{5}=\dfrac{2c-5a}{3}=\dfrac{5b-3c}{2}\) và a + b + c = -50