Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)2019-5{70+9[37-(32+1)]}=2019-5{70+9[37-33]}=2019-5{70+9.4}=2019-5.106=2019-530=1489
b)3[25-(9+8)]-25(8+1)=3[25-17]-25.9=3.8-225=-201
A, B, C,... là tên của bài bạn nha
VD: A, 15+x=15
B, 16+14+14+14
Giải:
\(358.2^3-\dfrac{5^{20}.3^{20}}{15^{18}}+3^2.2075^0\)
\(=358.2^3-\dfrac{5^{20}.3^{20}}{5^{18}.3^{18}}+3^2.1\)
\(=358.2^3-5^2.3^2+3^2\)
\(=358.2^3-3^2\left(5^2+1\right)\)
\(=358.2^3-3^2.26\)
\(=2\left(358.2^2-3^2.13\right)\)
\(=2.1315=2630\)
Vậy ...
(Mình nghĩ có sai sót gì đó, bạn xem lại đề)
Bài 1:
a) 6/2 x+ 1 = 2/7
6/2 x = 2/7 - 1
6/2 x = 2/7 - 7/7
6/2 x = -5/7
x = - 5/7 : 6/2
x = - 5/7 . 2/6
x = -5/21
Ủng hộ nha! :)
BÀI 1 a 6/2x+1=2/7
6/2x=2/7-1
6/2x=-5/7
6*7=5*2x
42=5*2x
42/5=2x
x=42/5:2
x=21/5
a,113-3+20
=1328+20
=1348
b,300+7781+1425
=9506
c,7+36-40
=43-40=3
a,
115 : 112 - 33 : ( 11 + 23 ) + 22 x 30 x 5
= 11( 5 - 2 ) - 27 : ( 1 + 8 ) + 4 x 1 x 5
= 113 - 27 : 9 + 4 x 5
= 1331 - 3 + 20
= 1328 + 20
= 1348
b,
12 x 25 + 31 x 251 + 57x 25
= 12 x 25 + 57 x 25 + 31 x 251
= ( 12 + 57 ) x 25 + 31 x 251
= 69 x 25 + 31 x 251
= 1725 + 7781
= 9506
c,
15 - 23 + 4 x 32 - 5 x 8
= 15 - 8 + 4 x 9 - 40
= 15 - 8 + 36 - 40
= 7 + 36 - 40
= 43 - 40
= 3
[545 - (45 + 4 x 25)] : 50 - 200 : 250 + 215 : 213
= [545 - (45 + 100)] : 50 - 200 : 250 + 22
= (545 - 4500) : 50 - 200 : 254
= (-3955) : 50 + 200 : 254
= [(-3955) + 200] : (50 + 254)
= (-3755) : 304
= bạn tự tính nha
[504 - (25 x 8 + 70)] : 9 - 15 + 190
= [504 - (200 + 70)] : 9 - 15 + 0
= (504 - 270) : 9 - 15
= 234 : 9 - 15
= 26 - 15
= 9
5 x {26 - [3 x 5 + 2 x 5 + 15] : 15}
= 5 x {26 - [(3 + 2) x 5) + 15] : 15}
= 5 x {26 - [5 x 5 + 15] : 15}
= 5 x [26 - (25 + 15) : 15]
= 5 x (26 + 25 - 15 : 15)
= 5 x (51 - 1)
= 5 x 50 = 250
d) [1104 - (25 x 8 + 40)] : 9 + 316 : 312
= [1104 - (200 + 40)] : 9 + 34
= (1104 - 240) : 9 + 81
= 864 : 9 + 81
= 96 + 81
= 177
Học tốt!!!
a) 274.93 = (92)4.93 = 98.93 = 911
b) 72018 : 7 = 72017
c) 420 : 40 = 420
d) (38.315) : ( 37.314) = 323 : 321 = 32
e) (215 : 210) : (218 : 215) = 25 : 23 = 22
f) ( 416. 42) : (420 :42)
g) 254 : 125
a) \(27^4.9^3=\left(3^3\right)^4.\left(3^2\right)^3=3^{12}.3^6=3^{12+6}=3^{18}\)
b) \(7^{2018}:7=7^{2018-1}=7^{2017}\)
c) \(4^{20}:4^0=4^{20}:1=4^{20}\)
d) \(\left(3^8.3^{15}\right):\left(3^7.3^{14}\right)=3^{8+15}:3^{7+14}=3^{23}:3^{21}=3^{23-21}=3^2\)
e) \(\left(2^{15}:2^{10}\right):\left(2^{18}:2^{15}\right)=\frac{2^{15-10}}{2^{18-15}}=\frac{2^5}{2^3}=2^{5-3}=2^2\)
f) \(\left(4^{16}.4^2\right):\left(4^{20}:4^2\right)=4^{16+2}:4^{20-2}=4^{18}:4^{18}=1\)
g) \(25^4:125=\left(5^2\right)^4:5^3=5^8:5^3=5^{8-3}=5^5\)
a) 50+3x(25-16)2+150
=50+3x92+1
=50+3x81+1
=50+243+1
=294
b)22x52-35/32
=(2x5)2-35-2
=102-33
=100-27
=73
c)80-[130-(12-4)2 ]
=80-[130-82 ]
=80-[130-64]
=80-66
=14
d)100:[2x(52-35-8)]
=100:[2x9]
=100:18
=100/18
e)24:{300:[375-(150+15x5)]}
=24:{300:[375-(150+75)]}
=24:{300:[375-225]}
=24:{300:50}
=24:6
=4
cho mik cách làm