a: =-231-16+75+25-9
=-240+100-16
=-140-16=-156
b: =231-17-77=231-94=137
d: =a+b+c-c-b+a=2a
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Các câu hỏi tương tự
Bài 1: Tính
a, 16/15. -5/4. 54/24. 56/21
b, -5/8 . -12/29 . 8/-10 . 29/5
Bài 2: Tính nhanh giá trị của các biểu thức sau:
a, 4.11 . 3/4 . 9/121
b, -7/25 . 39/ -17 . 50/78
c, 3/7. 2/5 . 7/3. 20 . 19/42
1. Tính
a, 1+7+8+15+23+...+160
b, 17+4+5+9+19+...+60+9
c, 78*3+78*24+78*17*22*72
d, 53*39+47*39+47-53*21-47*21
e, 2*53*12+4*6*87-3*8*40
g, 5*7*77-7*60+49*25-15*42
h, 1*2+2*3+3*4+...+2016*2017
tính nhanh :a) frac{-3}{7}+frac{15}{26}-left(frac{2}{13}-frac{3}{7}right)b) 2.frac{3}{7}+left(frac{2}{9}-1frac{3}{7}right)-frac{5}{3}:frac{1}{9}c) frac{-11}{23}.frac{6}{7}+frac{8}{7}.frac{-11}{23}-frac{1}{23}d) left(frac{377}{-231}-frac{123}{89}+frac{34}{791}right).left(frac{1}{6}-frac{1}{8}-frac{1}{24}right)
Đọc tiếp
tính nhanh :
a) \(\frac{-3}{7}+\frac{15}{26}-\left(\frac{2}{13}-\frac{3}{7}\right)\)
b) \(2.\frac{3}{7}+\left(\frac{2}{9}-1\frac{3}{7}\right)-\frac{5}{3}:\frac{1}{9}\)
c) \(\frac{-11}{23}.\frac{6}{7}+\frac{8}{7}.\frac{-11}{23}-\frac{1}{23}\)
d) \(\left(\frac{377}{-231}-\frac{123}{89}+\frac{34}{791}\right).\left(\frac{1}{6}-\frac{1}{8}-\frac{1}{24}\right)\)
Tính nhanh
a) dfrac{-3}{7}+dfrac{15}{26}-left(dfrac{2}{13}-dfrac{3}{7}right)
b) 2.dfrac{3}{7}+left(dfrac{2}{9}-1dfrac{3}{7}right)-dfrac{5}{3}:dfrac{1}{9}
c) dfrac{-11}{23}.dfrac{6}{7}+dfrac{8}{7}.dfrac{-11}{23}-dfrac{1}{23}
d) left(dfrac{377}{-231}-dfrac{123}{89}+dfrac{34}{791}right).left(dfrac{1}{6}-dfrac{1}{8}-dfrac{1}{24}right)
Đọc tiếp
Tính nhanh
a) \(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{3}{7}\right)\)
b) \(2.\dfrac{3}{7}+\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
c) \(\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\)
d) \(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
Bài 1 : Bỏ dấu ngoặc rồi thu gọn biểu thức:a)A(a+b)-(a-b)+(a-c)-(a+c)b)B(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)Bài 2 :a) thực hiện phép tính;(-5/28+1,75+8/35):(-3frac{9}{20})b) tính nhanh1/ -3/7+15/26-(2/13-3/7) 2/ 2.3/7+(2/9-1frac{3}{7})-5/3:1/93/ -11/23.6/7+8/7.-11/23-1/23 4/ (377/-231-123/89+34/791).(1/6-1/8-1/24)
Đọc tiếp
Bài 1 : Bỏ dấu ngoặc rồi thu gọn biểu thức:
a)A=(a+b)-(a-b)+(a-c)-(a+c)
b)B=(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)
Bài 2 :
a) thực hiện phép tính;
(-5/28+1,75+8/35):(-3\(\frac{9}{20}\))
b) tính nhanh
1/ -3/7+15/26-(2/13-3/7) 2/ 2.3/7+(2/9-1\(\frac{3}{7}\))-5/3:1/9
3/ -11/23.6/7+8/7.-11/23-1/23 4/ (377/-231-123/89+34/791).(1/6-1/8-1/24)
a, -13/30 + 11/20 - 7/15
b, -5 /72 : ( 3/8 . 7/9 )
c, -23/25 .10/17 + -23/25 . 3/13 + -27/25
a)dfrac{2}{7}+dfrac{-3}{8}+dfrac{11}{7}+dfrac{1}{7}_{ }+dfrac{5}{-8}
b)dfrac{3}{17}+dfrac{-5}{13}+dfrac{-18}{35}+dfrac{14}{17}+dfrac{17}{-35}_{ }+dfrac{-8}{13}
c)dfrac{-3}{8}+dfrac{12}{25}+dfrac{5}{-8}+dfrac{2}{-5}+dfrac{13}{25}
d)dfrac{-5}{21}+left(dfrac{-16}{21}+1right)
e)dfrac{-3}{17}+left(dfrac{2}{3}+dfrac{3}{17}right)
f)left(dfrac{-1}{6}+dfrac{5}{-12}right)+dfrac{7}{12}
Đọc tiếp
a)\(\dfrac{2}{7}+\dfrac{-3}{8}+\dfrac{11}{7}+\dfrac{1}{7}_{ }+\dfrac{5}{-8}\)
b)\(\dfrac{3}{17}+\dfrac{-5}{13}+\dfrac{-18}{35}+\dfrac{14}{17}+\dfrac{17}{-35}_{ }+\dfrac{-8}{13}\)
c)\(\dfrac{-3}{8}+\dfrac{12}{25}+\dfrac{5}{-8}+\dfrac{2}{-5}+\dfrac{13}{25}\)
d)\(\dfrac{-5}{21}+\left(\dfrac{-16}{21}+1\right)\)
e)\(\dfrac{-3}{17}+\left(\dfrac{2}{3}+\dfrac{3}{17}\right)\)
f)\(\left(\dfrac{-1}{6}+\dfrac{5}{-12}\right)+\dfrac{7}{12}\)
Bài 1: Tính
a, (4/1/9+3/1/4). 2/1/4+2/3/4
b, 9/23. 5/8+ 9/23. 3/8 - 9/23
c, 1+ (9/10 - 4/5) : 3/1/6
d, (-7+/13/) - (13- / -7/ -25) - (25 +/- 10/ -9)
HD
4 tháng 8 2017 lúc 16:29
Bài 1:
\(a)5\dfrac{1}{20}+\dfrac{8}{9}-\dfrac{15}{25}+\dfrac{75}{-18}\)
\(b)\dfrac{1}{15}+\dfrac{1}{35}+\dfrac{1}{63}+\dfrac{1}{99}+\dfrac{1}{143}\)
\(c)\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}.\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2\)