Tính nhanh
a ) 2 /3 x 8 / 17 + 2 /3 x 5 / 17 + 2/ 3 x 4 / 17
b) 35,16 - 44,84 : 4 + 15,6 x 24
tinh gia tri bieu thuc:
a) 35,16 - 44,84 : 4 + 15,6 x 24
b) 2,75 x a + 7,25 x a , biet a = 20,11
a, 35,16-44,84:4+15,6.24
=35,16-11.21+374,4
=398,35
b, Thay a=20,11 vào 2,75.a+7,25.a. Ta có:
2,75.20,11+7,25.20,11
=20,11.(2,75+7,25)
=20,11.10
=201,11
x.3 1/4+(-7/6).x-1 2/3=5/12
5 8/17:x+(-4/17):x+3 1/7:17 1/3=4/11
-1 5/27-(3x-7/9)^3=-24/27
3(x-1/2)-5(x+3/5)=-x+1/5
35,16+44,84:4-15,6
#)Giải :
35,16 + 44,84 : 4 - 15,6
= 35,16 + 11,2 - 15,6
= 46,36 - 15,6
= 30,76
#)Chúc bn học tốt :D
35,16+44,84:4-15,6
=35,16+11,21-15,6
=30,77
Học tốt
a, 2/3 x - 1/2 x = 5/12
b, ( x . 6 và 2/7 + 3/7 ) . 2 và 1/5 - 3/7 = - 2
c, x . 3 và 1/4 + ( - 7/6 ) . x - 1 và 2/3 = 5/12
d, 5 và 8/17 : x + ( - 4/ 17 ) : x + 3 và 1/7 : 17 và 1/3 = 4/11
e, ( x + 1/5 )2 + 17/25 = 26/25
g, - 1 và 5/27 - ( 3x - 7/9 )3 = - 24 /27
35,16 + 44,84 :4 - 15,6
35,16+44,84:4-15,6
=35,16+11,21-15,6
=46,37-15,6
=30,77
TÍNH GIÚP MÌNH NHA
a)35,16-44,84:4+15,6*24
b)45,651*73+45,651*20+45,651*7
c)305,765*100+305,765*0,001
a,35,16-44,84:4+15,6x24
=35,16-11,21+373,4
=23,95+373,4
=397,35
b, 45,651x73+45,651x20+45,651x7
=45,651x(73+20+7)
=45,651x100
=4565,1
c, 305,765x100+305,765x0,001
=305,765x(100+0,001)
=305,765x100,001
=30576,80577
câu b sai rồi ko tin bạn tính lại coi
-9/46-4 1/23:(3 1/4 - x:3/5)+2 8/23=1
(6 2/7*x + 3/7):2 1/5-3/7=-1
5 8/17:x+(-1/17):x +3 1/17:17 1/3=4/17
Tính bằng cách thuận tiên nhất:
1):(3/4 x 5/97 + 1/9 x 13/47) x (1/5 - 7/25 x 5/7)
2): 8/17 x 4/15 + 8/17 x 22/15 - 8/15 x 9/17
3): 2021/2 x 1/3 + 4042/4 x 1/5 + 6063/3 x 22/15
4); 4/7 x 2/13 + 8/13 :7/4 + 4/7 : 13/2 + 4/7 x 1/13
5): 2022 x 2021 - 1/ 2021 + 2022 x 2020
6): 18 x 123 + 9 x 4567 x 2 + 3 x 5310 x 6 / (2 + 4 + 6 + 8 + ...+20 + 22) + 48
7): A= 2021 x 2021 x 202020 - 2020 x 2020 x 20212021 / 2020 x 20192019
1) Ta có: \(\left(\dfrac{3}{4}\cdot\dfrac{5}{97}+\dfrac{1}{9}\cdot\dfrac{13}{47}\right)\cdot\left(\dfrac{1}{5}-\dfrac{7}{25}\cdot\dfrac{5}{7}\right)\)
\(=\left(\dfrac{3}{4}\cdot\dfrac{5}{97}+\dfrac{1}{9}\cdot\dfrac{13}{47}\right)\cdot\left(\dfrac{1}{5}-\dfrac{1}{5}\right)\)
=0
2) Ta có: \(\dfrac{8}{17}\cdot\dfrac{4}{15}+\dfrac{8}{17}\cdot\dfrac{22}{15}-\dfrac{8}{15}\cdot\dfrac{9}{17}\)
\(=\dfrac{8}{17}\left(\dfrac{4}{15}+\dfrac{22}{15}-\dfrac{9}{15}\right)\)
\(=\dfrac{8}{17}\cdot\dfrac{15}{15}=\dfrac{8}{17}\)
3) Ta có: \(\dfrac{2021}{2}\cdot\dfrac{1}{3}+\dfrac{4042}{4}\cdot\dfrac{1}{5}+\dfrac{6063}{3}\cdot\dfrac{22}{15}\)
\(=\dfrac{2021}{2}\left(\dfrac{1}{3}+\dfrac{1}{5}\right)+2021\cdot\dfrac{22}{15}\)
\(=\dfrac{2021}{2}\cdot\dfrac{8}{15}+\dfrac{2021}{2}\cdot\dfrac{44}{15}\)
\(=\dfrac{2021}{2}\cdot\dfrac{52}{15}\)
\(=\dfrac{52546}{15}\)
4) Ta có: \(\dfrac{4}{7}\cdot\dfrac{2}{13}+\dfrac{8}{13}:\dfrac{7}{4}+\dfrac{4}{7}:\dfrac{13}{2}+\dfrac{4}{7}\cdot\dfrac{1}{13}\)
\(=\dfrac{4}{7}\left(\dfrac{2}{13}+\dfrac{8}{13}+\dfrac{2}{13}+\dfrac{1}{13}\right)\)
\(=\dfrac{4}{7}\)
Tinh hop li neu co the
(3,25+7,35) . (6-1,2)- 2,4
35,16 -44,84 : 4 + 15,6 . 24
=10,5.4,8-2,4
=50,4-2,4
=48
=35,16-11,21+374,4
=23,95+374,4
=398,35