10*10*9+32=
Cho m= 3/5 x (6/7 x 8/9 x 10/11 x ... x 32/33) và N = 5/6 x 7/8 x 9/10 x ... x 31/32
đề bài là làm gì vậy bạn?
Tính m x n nhé bạn
Chứng minh (9^32+9^31):10
\(\text{Ta có : }9^{32}+9^{31}=9^{4\times8}+9^{28}+9^3\)
\(=\left(...1\right)+\left(...1\right)+\left(...9\right)=\left(...1\right)\)
\(\text{Suy ra đề sai}\)
Chứng minh rằng :
a, 7^8 + 7^9 + 7^10 ⋮ 57
b, 10^10 - 10^9 - 10^8 ⋮ 89
c, 64^10 - 32^11 - 16^13 ⋮ 19
a) 78 + 79 + 710
= 78 ( 1 + 7 + 72 )
= 78 . 57 chia hết cho 57
b ) 1010 - 109 - 108
= 108 ( 102 - 10 - 1 )
= 108 . 89 chia hết cho 89
7/4 - 5/8=
A.30/32 C.9/8
B.76/32 D.10/8
Tính bằng cách thuận tiện nhất :
4/3 x 32/10 + 8/3 : 10/36 - 4/10 x 12/9
giúp iêm đuy m.n :<<<
a: \(=\dfrac{4}{3}\cdot\dfrac{32}{10}+\dfrac{8}{3}\cdot\dfrac{36}{10}-\dfrac{4}{10}\cdot\dfrac{12}{9}\)
\(=\dfrac{128}{30}+\dfrac{288}{30}-\dfrac{48}{90}=\dfrac{416}{30}-\dfrac{24}{30}=\dfrac{392}{30}=\dfrac{196}{15}\)
Bài 2
9 tấn 754 kg = ………kg
264 cm = ....................m
4,81 m2 = .................…dm2
32, 5 x 0,01 = ..................
2,86 x 10 =....................
10, 23 : 10 =......................
98,3 : 0,1 =........................
9 tấn 754kg=9754 kg
264cm=2,64m
Tui sợ sai quá
9 tấn 754kg=9754 kg
264cm=2,64m
Tính:
1, 7/36- 8/-9 + -2/3
2, -1/2 + 3/7 - 1/9 + -7/18 + 4/7
3, -10/3 + 13/10 - 1/6 + 1/10
4, 10/17- 5/13 - (-7/17) - 8/13 + 11/25
\(1.\) \(\dfrac{7}{36}-\dfrac{8}{-9}+\dfrac{-2}{3}=\dfrac{7}{36}+\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{7+32-24}{36}=\dfrac{5}{12}.\)
\(2.\) \(\dfrac{-1}{2}+\dfrac{3}{7}-\dfrac{1}{9}+\dfrac{-7}{18}+\dfrac{4}{7}=\dfrac{-9-2-7}{18}+\dfrac{4+3}{7}=\dfrac{-18}{18}+\dfrac{7}{7}=-1+1=0.\)
\(3.\) \(-\dfrac{10}{3}+\dfrac{13}{10}-\dfrac{1}{6}+\dfrac{1}{10}=\dfrac{13+1}{10}+\dfrac{-20-1}{6}=\dfrac{14}{10}+\dfrac{-21}{6}=\dfrac{7}{5}-\dfrac{7}{2}=-\dfrac{21}{10}.\)
\(4.\) \(\dfrac{10}{17}-\dfrac{5}{13}-\left(-\dfrac{7}{17}\right)-\dfrac{8}{13}+\dfrac{11}{25}=\dfrac{10+7}{17}+\dfrac{-5-8}{13}+\dfrac{11}{25}=\dfrac{17}{17}-\dfrac{13}{13}+\dfrac{11}{25}=\dfrac{11}{25}.\)
Tính:
1, 7/36- 8/-9 + -2/3
2, -1/2 + 3/7 - 1/9 + -7/18 + 4/7
3, -10/3 + 13/10 - 1/6 + 1/10
4, 10/17- 5/13 - (-7/17) - 8/13 + 11/25
1: \(=\dfrac{7}{36}+\dfrac{32}{36}+\dfrac{-24}{36}=\dfrac{15}{36}=\dfrac{5}{12}\)
2: \(=\left(-\dfrac{1}{2}-\dfrac{1}{9}-\dfrac{7}{18}\right)+\dfrac{3}{7}+\dfrac{4}{7}\)
\(=\dfrac{-9-2-7}{18}+1=-1+1=0\)
3: \(=\left(-\dfrac{10}{3}-\dfrac{1}{6}\right)+\dfrac{14}{10}\)
\(=-\dfrac{21}{6}+\dfrac{14}{10}=\dfrac{-7}{2}+\dfrac{14}{10}=\dfrac{-35+14}{10}=-\dfrac{21}{10}\)
4: \(=\left(\dfrac{10}{17}+\dfrac{7}{17}\right)-\left(\dfrac{5}{13}+\dfrac{8}{13}\right)+\dfrac{11}{25}=\dfrac{11}{25}\)
-5/18+32/45-9/10
có phép tính phân số cũng đăng lên hỏi đôi lúc tự động não mới là tốt
Trả lời
-5/18+32/45-9/10
=(-25)+64-81/90
=-42/90
=-21/45
=-7/15
Lê Tài Bảo Châu nói đúng đó ^^
\(-\frac{5}{18}+\frac{32}{45}-\frac{9}{10}\)
\(=\left(-25\right)+64-\frac{81}{90}\)
\(=-\frac{7}{15}\)