bai 1 tính
a) 204 -84.12 b)15.2^3 +4 .3^2-5.7 c)5^6 : 5^3 +2^3 .2^2 d) 164.53+47.164
giup mk voi nhe lan nay ai nhanh nhat mk se tk cho
thực hiện phép tính
a) 204-84:12
b) 15.23+4.32-5.7
c) 56:53+23.22
d) 164.53+47.164
tìm x
219-7(x+1)=100
(3x-6).3=34
a)
204-84:12
=204-7
=197
b)
15.23+4.32-5.7
=15.8+4.9-5.7
=120+36-35
=156-35
=121
c)
56:53+23.22
=56-3+23+2
=53+25
=125+32
=157
d)
164.53+47.164
=(164.(53+47)
=164.100
=16400
tìm x:
219-7(x+1)=100
=>7(x+1)=219-100
=>7(x+1)=119
=>x+1=119:7
=>x+1=17
=>x=17-1
=>x=16
(3x-6).3=34
=>(3x-6).3=81
=>3x-6=81:3
=>3x-6=27
=>3x=27+6
=>3x=33
=>x=33:3
=>x=11
nhác động não bài dễ thế này ko chịu suy nghĩ cứ ỷ lại olm
a) 204 - 84 : 12 = 204 - 7
= 197
b) 15.23 + 4.32 - 5.7 = 15.8 + 4.9 - 35
= 120 + 36 - 35
= 121
c) 56: 53 + 23.22 = 53 + 25
= 125 + 32
= 157
d) 164.53 + 47.164 = 164.(53 + 47)
= 164. 100
= 16400
tim x
219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
Vay x = 16
(3x - 6).3 = 34
3x - 6 = 34 : 3
3x - 6 = 33
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
Vay x = 11
i giup mk lan Bai nay voi !
-12.(x-5)+7.(3-x)=5
mk se tick cho ai nhanh nhat !
-12 (x-5) + 7(3-x) =5
-12x + 60 + 21 -7x =5
x(-12-7) + 81 =5
-19x = -76
x= 4
\(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(\Rightarrow-12x-\left(-60\right)+21-7x=5\)
\(\Rightarrow-12x-7x+60+21=5\)
\(\Rightarrow-19x=5-60-21\)
\(\Rightarrow-19x=-76\)
\(\Rightarrow x=\frac{-76}{-19}=4\)
-12 . (x - 5) + 7 . (3 - x) = 5
-12x + 60 + 21 - 7x = 5
x . (-12 - 7) + 81 = 5
x . (-19) = 5 - 81
x . (-19) = -76
x = -76 : (-19)
x = 4
Vậy x = 4
Ủng hộ mk nha !!! ^_^
Thực hiện các phép tính :
a) \(204-84:12\)
b) \(15.2^3+4.3^2-5.7\)
c) \(5^6:5^3+2^3.2^2\)
d) \(164.53+47.164\)
a)
204 - 84:12 = 204 - 7 = 197
b)
15.23 + 4.32 - 5.7 = 15.8 + 4.9 – 5.7 = 120 + 36 - 35 = 121
c) Áp dụng:
am . an = am+n
am : an = am-n
56:53 + 23.22 = 53 + 25 = 125 + 32 = 157
d)
164.53 + 47.164 = 164(53 + 47) = 164.100 = 16400
a) 204 - 84 : 12
= 204 - 7 = 197
b) 15.23 + 4.32 - 5.7
= 15.8 + 4.9 - 35
= 120 + 36 - 35
= 156 - 35
= 121
c) 56 : 53 + 23.22
= 56 - 3 + 23 + 2
= 53 + 25
= 125 + 32
= 157
d) 164.53 + 47.164
= 164.( 53 + 47 )
= 164.100
= 16400
a) 204 - 84 : 12
= 204 - 7 = 197
b) 15.23 + 4.32 - 5.7
= 15.8 + 4.9 - 35
= 120 + 36 - 35
= 156 - 35
= 121
c) 56 : 53 + 23.22
= 56 - 3 + 23 + 2
= 53 + 25
= 125 + 32
= 157
d) 164.53 + 47.164
= 164.( 53 + 47 )
= 164.100
= 16400
204-84:12
15.23+4.32-5.7
56:53+23.22
164.53+47.164
204-84:2=204-42=162
15.23+4.32-5.7=15.8+4.9-35=120+36-35=121
56:53+23.22=15625:125+8.4=125+32=157
164.53+47.164=164.(53+47)=164.100=16400
HỌC TỐT.
cac bn giup mk bai nay vs !ai nhanh mk se tick
(3^A-1)(3^A-2)(3^A-3)(3^A-4)(3^A-5)(3^A-6)=2019^b+20159
tim x
a) 3^x -4 =5^7 : 5^6
b ) 3^x-1 =27
c) (x-1) ^3 = 4(x-1)
d) 5^x 5^x-2= 130
ai giup mk nhanh nhat mk se tick cho 4 lan luon
a , 3x - 4 = 57 : 56
3x - 4 = 57-6
3x -4 = 5
3x = 9
3x = 32
suy ra x = 2
Vậy x =2
b , 3x-1 = 27
3x-1 = 33
suy ra x - 1 =3 suy ra x = 3-1 =2
Vậy x =2
c , (x-1)3 = 4(x-1)
( x - 1)3 : ( x-1 ) = 4
(x-1)3-1 = 4
(x-1)2 = 22
suy ra x-1 =2 suy ra x = 2+1 =3
Vậy x =3
d , 5x . 5x-2 = 130
5x . 5x : 52 = 130
52x = 130 x 25
52s = 3250
suy ra x thuộc rỗng
Vậy x thuộc rỗng
a) 3^x -4 =5^7 : 5^6
3^x -4 =5
3^x=9
x=2
b ) 3^x-1=26
3^x=27
x=3
\(3^x-4=5^7:5^6\)
\(3^x-4=5\)
\(3^x=5+4\)
\(3^x=9\)
\(\Rightarrow x=2\)
\(3^x-1=26\)
\(3^x=26+1\)
\(3^x=27\)
\(\Rightarrow x=3\)
mk sẽ gửi câu hỏi tiếp nha
a)204-84:12
b)15.2(mũ3)+4.3(mũ 2)-5.7
c)5(mũ6):5(mũ3)+2(mũ3).2(mũ2)
d)164.53+47.164
a) \(204-84:12=204-7=197\)
b) \(15.2^3+4.3^2-5.7=15.8+4.9+5.7=120+36+35=156+35=191\)
c) \(5^6:5^3+2^3.2^2=5^3+2^5=125+32=157\)
d) \(164.53+47.164=164.\left(53+47\right)=164.100=16400\)
_Chúc bạn học tốt_
bai 1 tinh nhanh
a . 1/5x6 +1/6x7+ 1/7x8 + 1/8x9 +1/9x10
b . 1/1x2 + 1/2x3 + ....... + 1/99x100
c . 2/3x5 + 2/5x7 + 2/7x8 + 2/8x9
d . 2/3x5 + 2/5x7 + .......+ 2/98x100
bai 2 tinh hop li
9/13 + 14/6 + 1/9 + 4/6 + 7/13 + 17/19
bai 3 dien dau ( > , < , = )
a . 3/4 + 5/2 ....... 5/8 + 2 3/5 ( hon so )
B . 3 1/5 - 8/3 ......... 17/5 - 2 12/5 hon so
c . 2 4/9 + 18/7......... 22/9 + 2 4/7
giup mk nha cac ban , mai mk phai nop bai roi toi nay mk se lay y kien cua cac ban , giup mk nha
b1
a) \(\dfrac{1}{5.6}+\dfrac{1}{6.7}+\dfrac{1}{7.8}+\dfrac{1}{8.9}+\dfrac{1}{9.10}\)
\(=\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{10}\)
\(=\dfrac{1}{5}-\dfrac{1}{10}\)
\(=\dfrac{2}{10}-\dfrac{1}{10}\)
\(=\dfrac{1}{10}\)
b) \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+...+\dfrac{1}{99.100}\)
\(=\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{99}-\dfrac{1}{100}\)
\(=\dfrac{1}{1}-\dfrac{1}{100}\)
\(=\dfrac{99}{100}\)
c) \(\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+\dfrac{2}{9.11}\)
\(=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}\)
\(=\dfrac{1}{3}-\dfrac{1}{11}\)
\(=\dfrac{8}{33}\)
d) \(\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{99.101}\)
\(=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{99}-\dfrac{1}{101}\)
\(=\dfrac{1}{3}-\dfrac{1}{101}\)
\(=\dfrac{98}{303}\)
1.Thực Hiện Các Phép Tính
A. 204-84;12 B.15.23+4.32-5.7 C.56;53+23.22 D.164.53+47.164
a) 204 - 84 : 12 = 204 - 7 = 197
b) 15.23 + 4 . 32 - 5.7 = 15 . 8 + 4 . 9 - 5 . 7 = 120 + 36 - 35 = 121
c) 56 : 53 + 23 . 22 = 15625 : 125 + 8 . 4 = 125 + 32 = 157
d) 164 . 53 + 47 x 164 = 164 x ( 53 + 47 ) = 164 x 100 = 16400
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