Tính giá trị biểu thức A = 8 3/17. 5 1/4 +3 14/17 . 5 1/4 / ( 1 14/17 - 1 1/34) . 34
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Tính giá trị biểu thức A = 8 3/17. 5 1/4 +3 14/17 . 5 1/4 / ( 1 14/17 - 1 1/34) . 34
\(A=\frac{8\frac{3}{17}.5\frac{1}{4}+3\frac{14}{17}.5\frac{1}{4}}{\left(1\frac{14}{17}-1\frac{1}{34}\right).34}\)
Bài 1. Tính giá trị biểu thức
a) A= 1+2-3-4+5+6-7-8+...-79-80+81
b) B= 1-2+3-4+...+99-100
c) -48+48.(-78)+48.(-21)
d) 13.(23+22)-3.(17+28)
e) 34+35+36+37-14-15-16-17
f) -7264+(1543+7264)
8 tháng 5 2022 lúc 15:13
a)4/5-(1/5+1/3)
b)12/7-(3/14-1)
c)11/2-9(7/5-1/2)
d)3x9(4/7+3/5)
e) (1/3-1/5):2
f)123/34:1/17-21/34:1/17
a) \(\dfrac{4}{5}-\left(\dfrac{1}{5}+\dfrac{1}{3}\right)=\dfrac{4}{5}-\left(\dfrac{3}{15}+\dfrac{5}{15}\right)=\dfrac{4}{5}-\dfrac{8}{15}=\dfrac{12}{15}-\dfrac{8}{15}=\dfrac{4}{15}\)
b) \(\dfrac{12}{7}-\left(\dfrac{3}{14}-1\right)=\dfrac{12}{7}-\left(-\dfrac{11}{14}\right)=\dfrac{12}{7}+\dfrac{11}{14}=\dfrac{5}{2}\)
c) \(\dfrac{11}{2}-9\cdot\left(\dfrac{7}{5}-\dfrac{1}{2}\right)=\dfrac{11}{2}-9\cdot\dfrac{9}{10}=\dfrac{11}{2}-\dfrac{81}{10}=\dfrac{55}{10}-\dfrac{81}{10}=-\dfrac{13}{5}\)
d) \(3\times9\left(\dfrac{4}{7}+\dfrac{3}{5}\right)=27\times\dfrac{41}{35}=\dfrac{1107}{35}\)
e) \(\left(\dfrac{1}{3}-\dfrac{1}{5}\right):2=\left(\dfrac{5}{15}-\dfrac{3}{15}\right):2=\dfrac{2}{15}:2=\dfrac{2}{15}\times\dfrac{1}{2}=\dfrac{1}{15}\)
f) \(\dfrac{123}{34}:\dfrac{1}{17}-\dfrac{21}{34}:\dfrac{1}{17}=\left(\dfrac{123}{34}-\dfrac{21}{34}\right):\dfrac{1}{17}=3:\dfrac{1}{17}=3\times17=51\)
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tính giá trị biểu thức :
a ( 1/6 + 5/9 ) + 4/9
b 3/17 + (14/17 - 2/3 )
c ( 3/2 - 2/3 ) + 7/6
a) \(\left(\dfrac{1}{6}+\dfrac{5}{9}\right)+\dfrac{4}{9}\)
\(=\dfrac{1}{6}+\dfrac{5}{9}+\dfrac{4}{9}\)
\(=\dfrac{1}{6}+1\)
\(=\dfrac{7}{6}\)
b) \(\dfrac{3}{17}+\left(\dfrac{14}{17}-\dfrac{2}{3}\right)\)
\(=\dfrac{3}{17}+\dfrac{14}{17}-\dfrac{2}{3}\)
\(=1-\dfrac{2}{3}\)
\(=\dfrac{1}{3}\)
c) \(\left(\dfrac{3}{2}-\dfrac{2}{3}\right)+\dfrac{7}{6}\)
\(=\left(\dfrac{9}{6}-\dfrac{4}{6}\right)+\dfrac{7}{6}\)
\(=\dfrac{13}{6}+\dfrac{7}{6}\)
\(=\dfrac{20}{6}\)
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1) Tính giá trị các biểu thức :
a) C = 5/18 + 8/19 - 7/21 + ( -10/36 + 11/19 + 1/3) - 5/8
b) F = 15/14 - ( 17/23 - 80/87 + 5/4 ) + ( 17/23 - 15/14 + 1/4 )
c) G = 1/25 - 4/27 + ( -23/27 + -1/25 - 5/43 ) + 5/43 - 4/7
a) Ta có:
C = 5/18 + 8/19 - 7/21 + (-10/36 + 11/19 + 1/3) - 5/8
C = 5/18 + 8/19 - 1/3 - 5/18 + 11/19 + 1/3 - 5/8
C = (5/18 - 5/18) + (8/19 + 11/19) - (1/3 - 1/3) - 5/8
C = 1 - 5/8
c = 3/8
b) F = 15/14 - (17/23 - 80/87 + 5/4) + (17/23 - 15/14 + 1/4)
F = 15/14 - 17/23 + 80/87 - 5/4 + 17/23 - 15/14 + 1/4
F = (15/14 - 15/14) - (17/23 - 17/23) + 80/87 - (5/4 - 1/4)
F = 80/87 - 1
F = -7/87
c) G = 1/25 - 4/27 + (-23/27 + -1/25 - 5/43) + 5/43 - 4/7
G = 1/25 - 4/27 - 23/27 - 1/25 - 5/43 + 5/43 - 4/7
G = (1/25 - 1/25) - (4/27 + 23/27) - (5/43 - 5/43) - 4/7
G = -1 - 4/7 = -11/7
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1.Tính giá trị các biểu thức sau:
a)7/-24 +3/2 -9/8 +11/-4
b)6/13 + -17/39 -7/3
c)-17/13 - 4/-13 + 100/47
d)-7/2 + 6/5 - 1/2 -3/5
e12/-11 + 3/7 + 8/14 + (-1)
tính A=\(8\frac{3}{19}.5\frac{1}{4}+3\frac{16}{19}.5\frac{1}{4}\)phần \(\left[2\frac{14}{17}-2\frac{1}{34}\right]-34\)
Tính \(A=\frac{8\frac{3}{9}.5\frac{1}{4}+3\frac{16}{19}.5\frac{1}{4}}{\left(2\frac{14}{17}-2\frac{1}{34}\right)34};\frac{7}{24}\)