tính nhanh : 31 x 16 + 84 x 31 + 46 =
K
Khách
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TD
1
TD
7
31 tháng 12 2016
27 x 31 + 31 x 73
= 31 x ( 27 x 73 )
= 31 x 100
= 3100
16 x 98 + 16 x 2
= 16 x ( 98 + 2 )
= 16 x 100
= 1600
11 tháng 2 2017
b/ =-36.16+36.41-16.41+16.36
=36.41-16.41
=41.(36-16)
=41.20
=820
17 tháng 10 2016
bạn sai đề rồi, phải là:
2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 24 x31+24 x 42+ 24 x 3
=24x(31+42+27)
=24x 100
=2400
13 tháng 9 2016
tính nhanh
a, 53 . 84 + 212 . 29
= 4452 + 6148
= 10600
b, 79 . 17 + 21 . 18
= 1343 + 378
= 1721
c, 16 + 21 + 26 + 31 + ... + 96 + 101
= ( 101 + 16 ) x 18 2
= 1053
H9
HT.Phong (9A5)
CTVHS
13 tháng 7 2023
a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
13 tháng 7 2023
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
KV
10 tháng 12 2023
a) 135 . (-27) + 27 . 235
= 27 . (235 - 135)
= 27 . 100
= 2700
b) 36 . (-125) - 125 . (-46)
= 125 . (-36 + 46)
= 125 . 10
= 1250
c) 32 . (-64) - 64 . 68
= 64.(-32 - 68)
= 64.(-100)
= -6400
d) (145 - 45) . (-31) + 31 . (-100)
= 100 . (-31) + 31.(-100)
= 100.(-31 - 31)
= 100.(-62)
= -6200
10 tháng 12 2023
a)
=(-135)x27+27x235
=27x[+(235+135)]
=27x31725
=856575
b)
=(-36)x125-125x(-46)
=125x[-(36+46)]
=125x(-1656)
=-207000
c)
=(-32)x64-64x68
=64x[-(68-32)]
=64x(-36)
=-(64x36)
=-2304
d)
=100x(-31)+31x(-100)
=(-100)x31+31x(-100)
=31x[-(100+100)]
=31x(-200)
=-(31x200)
=-6200
chúc học tốt nhớ tích cho tui nha
4 tháng 6 2021
Giải;
1) \(347.222-222.\left(216+184\right):8\)
\(=347.222-222.400:8\)
\(=347.222-222.50\)
\(=222.\left(347-50\right)\)
\(=222.297\)
\(=65934\)
2) \(132-\left[116-\left(132-128\right).22\right]\)
\(=132-\left[116-4.22\right]\)
\(=132-\left[116-88\right]\)
\(=132-28\)
\(=104\)
3) \(16:\left\{400:\left[200-\left(37+46.3\right)\right]\right\}\)
\(=16:\left\{400:\left[200-\left(37+138\right)\right]\right\}\)
\(=16:\left\{400:\left[200-175\right]\right\}\)
\(=16:\left\{400:25\right\}\)
\(=16:16\)
\(=1\)
4) \(\left\{184:\left[96-124:31\right]-2\right\}.3651\)
\(=\left\{184:\left[96-4\right]-2\right\}.3651\)
\(=\left\{184:92-2\right\}.3651\)
\(=\left\{2-2\right\}.3651\)
\(=0.3651\)
\(=0\)
5) \(46-\left[\left(16+71.4\right):15\right]-2\)
\(=46-\left[\left(16+284\right):15\right]-2\)
\(=46-\left[300:15\right]-2\)
\(=46-20-2\)
\(=24\)
6) \(3^3.18+72.4^2-41.18\)
\(=18.\left(27-41\right)+72.16\)
\(=18.-14+1152\)
\(=-252+1152\)
\(=900\)
4 tháng 6 2021
Giải: (tiếp)
7) \(\left(56.46-25.23\right):23\)
\(=\left(2576-575\right):23\)
\(=2001:23\)
\(=87\)
8) \(\left(28.54+56.36\right):21:2\)
\(=\left(1512+2016\right):21:2\)
\(=3528:21:2\)
\(=84\)
9) \(\left(76.34-19.64\right):\left(38.9\right)\)
\(=\left(2584-1216\right):342\)
\(=1368:342\)
\(=4\)
10) \(\left(2+4+6+...+100\right).\left(36.333-108.111\right)\)
\(=\left(2+4+6+...+100\right).\left(11988-11988\right)\)
\(=\left(2+4+6+...+100\right).0\)
\(=0\)
11) \(\left(5.4^{11}-3.16^5\right):4^{10}\)
\(=5.4^{11}:4^{10}-3.16^5:4^{10}\)
\(=5.4-3.1\)
\(=20-3\)
\(=17\)
12) \(7256.4375-725:3650+4375.7255\)
\(=4375.\left(7256+7255\right)-\dfrac{29}{146}\)
\(=4375.14511-\dfrac{29}{146}\)
\(=63485624,8\)
Câu 12 ko chắc!
31 x 16 + 84 x 31 + 46
= 31 x ( 16 + 31 + 46 )
= 31 x 93
= 2883
ta có 31x 16 +84x31 +46
= 31 x (16+ 84 ) +46
= 31x 100 +46
= 3100 + 46
= 3146
kik mình nha.... học tốt