Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
32 . {160 : [ 300 - (175 + 21 . 5) ] }
= 32 . {160 : [ 300 - 280 ] }
= 32 . {160 : 20}
= 32 . 8
= 256
a, 15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0
= 15.{32:[1+15]+3}–1
= 15.5–1
= 74
b, 25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }
= 25.{128:[8+4.2]–16}
= 25.24
= 600
c, 2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }
= 2019.{101–1000:[(32+125–36):11–1]}
= 2019.{101–1000:[121:11–1]}
= 2019.{101–1000:10}
= 2019.1
= 2019
\(32\div\left\{160\div\text{[}300-\left(175+21\times5\right)\text{]}\right\}\)
\(=32\div\left\{160\div\text{[}300-\left(175+105\right)\text{]}\right\}\)
\(=32\div\left\{160\div\text{[}300-280\text{]}\right\}\)
\(=32\div\left\{160\div20\right\}\)
\(=32\div8\)
\(=4\)
32: { 160 : [300 - (175 + 105 ) ]}
= 32: {160 : [300 - 280]}
= 32 : {160 : 20 }
= 32 : 8
= 4
3: =231+26-209-26=22
4: =19(25+30+45)=19x100=1900
5: =-50+19+143+79-25-48
=-75+95+98
=98+20=118
a: =(375-175)+(369-169)+...+(207-7)
=200+200+...+200
=200*[(375-207)/2+1]
\(=200\cdot85=17000\)
b: \(=\left(24-11\right)+\left(32-19\right)+\left(40-27\right)+...+\left(336-323\right)\)
\(=13\cdot\left[\left(336-24\right):8+1\right]=13\cdot40=520\)
c: \(=\left(5-2\right)+\left(8-4\right)+\left(11-6\right)+...+\left(140-92\right)\)
=3+4+5+...+48
Số số hạng là (48-3):1+1=45+1=46(số)
Tổng là: (48+3)*46/2=51*23=1173
d: \(=\left(300-285\right)+\left(295-278\right)+\left(290-271\right)+...+\left(100-5\right)+10\)
=15+17+19+...+95+10
Số số lẻ trong khoảng từ 15 đến 95 là:
(95-15):2+1=41(số)
Tổng của dãy số trên là:
10+(95+15)*41/2
=10+55*41
=2265
Câu 2
a. 7.24.25
= 7.4.6.25
= (7.6).(25.4)
= 42.100
= 42000
b. 23.75 + 25.23 + 180
= 23.(75+25)+180
= 23.100+180
= 2300+180=2480
d. 32 : {160 : [300 - (175+21.5)]}
= 32:{160:[300-(175+105)]}
= 32:[160:(300-280)]
= 32:(160:20)
= 32:8
= 4
bạn ơi hình như câu c sai đề rồi
a. 7.24.25=7.(6.4).25=(7.6).(4.25)=42.100=4200.
b. 23.75+25.23+180=23.(75+25)+180=23.100+180=2300+180=2480.
c. 5.42-18:32( câu này sai đề hay sao ấy bạn ạ)
d. 32:{160:[300-(175+21.5)]}=32:{160:[300-(175+105)]}=32:{160:[300-280]}=32:{160:20}=32:8=4.
a: \(20-\left[30-\left(5-1\right)^2\right]\)
\(=20-\left[30-4^2\right]\)
\(=20-14=6\)
b: \(71+\dfrac{50}{5+3\left(57-6\cdot7\right)}\)
\(=71+\dfrac{50}{5+3\cdot\left(57-42\right)}\)
\(=71+\dfrac{50}{5+3\cdot15}=71+\dfrac{50}{50}=72\)
c: \(4\cdot\left\{270:\left[50-\left(2^5+45:5\right)\right]\right\}\)
\(=4\cdot\left\{270:\left[50-32-9\right]\right\}\)
\(=4\cdot\left\{\dfrac{270}{50-41}\right\}=4\cdot\dfrac{270}{9}=4\cdot30=120\)
d: \(411-\left[\dfrac{\left(107+3\right)}{5}-2^2\right]\)
\(=411-\left[\dfrac{110}{5}-4\right]\)
=410-22+4
=410-18
=392
e: \(450-5\left[3^2\left(7^5:7^3-41\right)-12\right]+18\)
\(=450-5\left[9\cdot\left(7^2-41\right)-12\right]+18\)
\(=450-5\cdot\left[9\cdot8-12\right]+18\)
=468-5*60
=468-300
=168
f:
\(102-150:\left[18-2\cdot\left(10-8\right)^2\right]+1018^0\)
\(=102-150:\left[18-2\cdot4\right]+1\)
\(=103-\dfrac{150}{18-8}=103-15=88\)
290-10.(2018^0+3^5:3^2)
=290-10.(1+243:9)
=290-10.(1+27)
=290-10.28
=290-280
=10
71-50:[5+3.(57-6.7)]