Tính giá trị
A=5/13-0,25-(10/9+18/13-1/4)
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Tính giá trị
A=1 5/13-0,25-(2 5/9+18/13-1/4)
Câu 1: Tìm x, biết:a)x^2-dfrac{16}{25}0 b)dfrac{2}{5}-left|dfrac{1}{2}-xright|6C2.Tính giá của biểu thức: a)A1dfrac{5}{13}-0,25-left(2dfrac{5}{9}+dfrac{18}{13}-dfrac{1}{4}right)b)dfrac{dfrac{3}{5}.7^2-3.5^6+dfrac{3}{5}.3^9}{dfrac{3}{4}.7^2-dfrac{3}{4}.5^7+dfrac{3}{4}.3^9}
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Câu 1: Tìm x, biết:
a)\(x^2-\dfrac{16}{25}=0\) b)\(\dfrac{2}{5}-\left|\dfrac{1}{2}-x\right|=6\)
C2.Tính giá của biểu thức:
a)\(A=1\dfrac{5}{13}-0,25-\left(2\dfrac{5}{9}+\dfrac{18}{13}-\dfrac{1}{4}\right)\)
b)\(\dfrac{\dfrac{3}{5}.7^2-3.5^6+\dfrac{3}{5}.3^9}{\dfrac{3}{4}.7^2-\dfrac{3}{4}.5^7+\dfrac{3}{4}.3^9}\)
a)
x^2-16/25=0
x^2-4^2/5^2=0
=>x-4/5=0
x=0+4/5
x=0/5
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1. Tính hợp lí:
a) B = 1/2 - [ 3/8 + ( -7/4 ) ]
b) -4/12 - ( -13/39 - 0,25 ) + 0,75
c) 1/2 - 1/3 + 1/23 + 1/6
d) ( -13/7 - 4/9) - ( -10/7 - 4/9 )
e) ( 7/8 - 5/2 + 4/7 ) - ( -3/7 + 1 - 13/8 )
f) -3/7 + ( 3 - 3/4 ) - ( 2,25 - 10/7)
g) ( 5/3 - 3/7 + 9 ) - ( 2 + 5/7 - 2/3 ) + ( 8/7 - 4/3 - 10 )
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
\(1.\) \(\dfrac{7}{36}-\dfrac{8}{-9}+\dfrac{-2}{3}=\dfrac{7}{36}+\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{7+32-24}{36}=\dfrac{5}{12}.\)
\(2.\) \(\dfrac{-1}{2}+\dfrac{3}{7}-\dfrac{1}{9}+\dfrac{-7}{18}+\dfrac{4}{7}=\dfrac{-9-2-7}{18}+\dfrac{4+3}{7}=\dfrac{-18}{18}+\dfrac{7}{7}=-1+1=0.\)
\(3.\) \(-\dfrac{10}{3}+\dfrac{13}{10}-\dfrac{1}{6}+\dfrac{1}{10}=\dfrac{13+1}{10}+\dfrac{-20-1}{6}=\dfrac{14}{10}+\dfrac{-21}{6}=\dfrac{7}{5}-\dfrac{7}{2}=-\dfrac{21}{10}.\)
\(4.\) \(\dfrac{10}{17}-\dfrac{5}{13}-\left(-\dfrac{7}{17}\right)-\dfrac{8}{13}+\dfrac{11}{25}=\dfrac{10+7}{17}+\dfrac{-5-8}{13}+\dfrac{11}{25}=\dfrac{17}{17}-\dfrac{13}{13}+\dfrac{11}{25}=\dfrac{11}{25}.\)
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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: \(=\left(\dfrac{10}{17}+\dfrac{7}{17}\right)-\left(\dfrac{5}{13}+\dfrac{8}{13}\right)+\dfrac{11}{25}=\dfrac{11}{25}\)
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tính hợp lí
a) (3/4 + 6/13) + (7/13 +8/45 + 0,25 )
b) (5|1/7 + 19/24 ) + (7bốn hai / năm hai + một 10/9 ) + 9/52
a)=3/4+6/13+7/13+8/45+0,25
=(6/13+7/13)+(3/4+0,25)+8/45
=1+1+8/45
=98/45
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a)=3/4+6/13+7/13+8/45+1/4
=(3/4+1/4)+(6/13+7/13)+8/45
=1+1+8/45=2+8/45=90/45+8/45=98/45
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Tính:
-15-(+9)
4-(-7)
-12+(-13)
-(-13)-(-10)
-4-(+7)
(-9)-(-13)
-(-12)+0
0-(+7)
0-(-3)
15-17
-18+12
-5-18
-(-15)+(-15)
Giúp e vs ạ
...=-15-9=-24
...=4+7=11
...=-12-13=-25
...=13+10=23
...=-4-7=-11
...=-9+13=4
...=12+0=12
...=0-7=-7
...=0+3=3
...=15-17=-2
...=-6
...=-23
...=15-15=0
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-15-(+9) = -24
4-(-7) = 11
-12+(-13) = -25
-(-13)-(-10) = 23
-4-(+7) = -11
(-9)-(-13) = 4
-(-12)+0 = 12
0-(+7) = -7
0-(-3) = 3
15-17 = -2
-18+12 = -6
-5-18 = -23
-(-15)+(-15) = 0
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Thực hiện phép tính ( tính nhanh nếu có thể ):
a, ( -3/4 + 5/13 ) : 2/7 - ( 9/4 + 8/13 ) : 2/7
b, (-12 . 2/7 + 8/9 : 7/2 - 2/7 . 5/18 ) . 7/2
c, 45/4 - ( 19/7 + 21/4 )
d, -1/4 . 152/11 - 0,25 . 68/11
a: \(=\dfrac{7}{2}\left(-\dfrac{3}{4}+\dfrac{5}{13}-\dfrac{9}{4}-\dfrac{8}{13}\right)=\dfrac{7}{2}\cdot\left(-3-\dfrac{3}{13}\right)=\dfrac{7}{2}\cdot\dfrac{-42}{13}=\dfrac{-147}{13}\)
b: \(=-12+\dfrac{8}{9}-\dfrac{5}{18}=\dfrac{-216}{18}+\dfrac{16}{18}-\dfrac{5}{18}=\dfrac{-205}{18}\)
c: \(=\dfrac{45}{4}-\dfrac{19}{7}-\dfrac{21}{4}=6-\dfrac{19}{7}=\dfrac{23}{7}\)
d: \(=\dfrac{-1}{4}\left(\dfrac{152}{11}+\dfrac{68}{11}\right)=\dfrac{-1}{4}\cdot20=-5\)
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Tính giá trị biểu thức:-1/4*13 9/11 -0,25*6 2/11
13 9/11,6 2/11 là hỗn số nha!!!.....Cần gấp (-*^*-)