3^3 x 2^n= 432
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bài 1
a, 432 x 25 + 46 x 432 - 432
= 432 x ( 25 + 46 - 1)
=432 x 70
=30 240
b, 432 : 6 - 232 : 6 + 102 : 6
=(432 - 232 +102) : 6
=302:6
=50,333333333333..................
bài 2
a, 285 * x + 115 * x = 400
(285 + 115) * x = 400
400 * x = 400
x = 400 : 400
x = 1
b, x - 6 : 2 - (48 - 24 x 2 : 6 - 3) = 0
x - 3 - (48 - 48 : 6 - 3) = 0
x - 3 - ( 48 - 8 - 3) = 0
x - 3 - 37 = 0
x - 3 = 0 + 37
x - 3 =37
x = 37 + 3
x = 40
a) 432x25+46x432-432
=10800+19872-432
=30240
ban oi cau b sai đề hay gì đó
1.
a. = 135 x ( 6 + 4 )
= 135 x 10
= 1350
b. = 432 x (4 + 3 + 2 + 1)
= 432 x 10
= 4320
2.
a. X x (2 + 3 + 4) = 234
X x 9 = 234
X = 234 : 9
X = 26
b. X x (1 + 2) = 12
X x 3 = 12
X = 12 : 3
X = 4
c. X x (1 + 3 + 5) = 135
X x 9 = 135
X = 135 : 9
X = 15
A)135x(4+6)=135x10=1350
B)432x(4+3+2+1)=432x10=4320
A)Xx(2+3+4)=234
Xx9=234
X=36
a: =>3x-15-2x+6=51
=>x-9=51
=>x=60
b: =>432-2x+22+3x-15=200
=>x+439=200
=>x=-239
c: =>3x+17-4x+13=0
=>30-x=0
=>x=30
d: =>x-3-3x+6=-11-21=-32
=>-2x+3=-32
=>-2x=-35
=>x=35/2
\(3\cdot\left(x-5\right)-2\cdot\left(x-3\right)=51\)
\(\Rightarrow3x-15-2x+6=51\)
\(\Rightarrow x-9=51\)
\(\Rightarrow x=51+9\)
\(\Rightarrow x=60\)
b) \(432-2\cdot\left(x-11\right)+3\cdot\left(x-5\right)=200\)
\(\Rightarrow432-2x+22+3x-15=200\)
\(\Rightarrow x+439=200\)
\(\Rightarrow x=200-439\)
\(\Rightarrow x=-239\)
c) \(3x+17=4x-13\)
\(\Rightarrow4x-3x=17+13\)
\(\Rightarrow x=30\)
d) \(\left(x-3\right)+21=3\cdot\left(x-2\right)-11\)
\(\Rightarrow x-3+21=3x-6-11\)
\(\Rightarrow x+18=3x-17\)
\(\Rightarrow3x-x=18+17\)
\(\Rightarrow2x=35\)
\(\Rightarrow x=\dfrac{35}{2}\)
\(1+2+3+...+x=500500\)
\(\Rightarrow\frac{x.\left(x+1\right)}{2}=500500\)
\(\Rightarrow x.\left(x+1\right)=1001000\)
\(\Rightarrow1000.1001\)
..
Hiệu x – y | 432 | 308 | 602 | 2000 | 2345 |
Tỉ số x : y | 4:1 | 2:1 | 6:3 | 5:3 | 7:2 |
x | 576 | 616 | 1206 | 5000 | 3283 |
y | 144 | 308 | 603 | 3000 | 938 |
a) \(2\times x+3\times x=\frac{5}{2}\)
=> \(\left(2+3\right)\times x=\frac{5}{2}\)
=> \(5\times x=\frac{5}{2}\)
=> \(x=\frac{5}{2}:5=\frac{5}{2}\times\frac{1}{5}=\frac{1}{2}\)
b) \(145+x\times12-432=253\)
=> \(145+x\times12=253+432\)
=> \(145+x\times12=685\)
=> \(x\times12=685-145\)
=> \(x\times12=540\Rightarrow x=45\)
Câu a) 2 x X + 3 x X = 5/2
( 2+3 ) x X = 5/2
5 x X = 5/2
X =5/2 : 5
X = 1/2
Câu b) 145 + X x 12 - 432 = 253
145 + X x 12 = 253 + 432
145 + X x 12 = 685
X x 12 = 685 - 145
X x 12 = 540
X = 540 : 12
X = 45
(x + 5)3 . 2 = 432
(x + 5)3 = 432 : 2
(x + 5)3 = 216
x + 5 = \(\sqrt[3]{216}\)
x + 5 = 6
x = 6 - 5
x = 1
***
x3 + 52 . 32 = 252
x3 + 25 . 9 = 252
x3 + 225 = 252
x3 = 252 - 225
x3 = 27
x3 = \(\sqrt[3]{27}\)
x = 3
a) (x + 5)3.2 = 432
=> (x + 5)3 = 432 : 2
=> (x + 5)3 = 216 = 63
=> x + 5 = 6
=> x = 6 - 5
=> x = 1
b) x3 + 52.32 = 252
=> x3 + 25.9 = 252
=> x3 + 225 = 252
=> x3 = 252 - 225
=> x3 = 27 = 33
=> x = 3
\(70-5\cdot\left(x-3\right)=45\)
\(\Rightarrow5\cdot\left(x-3\right)=70-45\)
\(\Rightarrow5\cdot\left(x-3\right)=25\)
\(\Rightarrow x-3=\dfrac{25}{5}\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3=8\)
==============
\(10+2\cdot x=4^5:4^3\)
\(\Rightarrow10+2\cdot x=4^2\)
\(\Rightarrow10+2\cdot x=16\)
\(\Rightarrow2\cdot x=16-10\)
\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
=============
\(2\cdot x-138=2^3\cdot3^2\)
\(\Rightarrow2\cdot x-138=72\)
\(\Rightarrow2\cdot x=72+138\)
\(\Rightarrow2\cdot x=210\)
\(\Rightarrow x=\dfrac{210}{2}=105\)
==============
\(231-\left(x-6\right)=1339:12\)
\(\Rightarrow231-x+6=1339:12\)
\(\Rightarrow237-x=\dfrac{1339}{12}\)
\(\Rightarrow x=237-\dfrac{1339}{12}\)
\(\Rightarrow x=\dfrac{1505}{12}\)
TL:
33 . 2n = 432
33 . 2n = 24 . 33
\(\Rightarrow\) 2n = 24
n = 4
Vậy n = 4
HT
@@@@@
=> 27 x 2^n = 432
=> 2^n = 16
=> 2^n = 2^4
=> n = 4
Chúc em học tốt nha:3