765 : 27 = ?
3358 : 23 = ?
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a) 25 : x = x
25 = x^2
x^2 = ( +-5 )^2
b) 3358 : 23 = 2x - 6
146 = 2x - 6
2x = 152
x = 76
c) ( 2x + 1 )^3 = 27 = 3^3
=> 2x + 1 = 3
=> 2x = 2
=> x = 1
d) ( x - 2 )^3 = ( x - 2 )^2
( x - 2 )^2 . ( x - 2 ) - ( x -2 )^2 = 0
( x - 2 )^2 . [ ( x - 2 ) - 1 ] = 0
+) x - 2 = 0
=> x = 2
+) x - 2 - 1 = 0
x - 3 = 0
x = 3
\(25\div x=x\Rightarrow x.x=25\Rightarrow x^2=25\Rightarrow\orbr{\begin{cases}x=5\\x=-5\end{cases}}\)
\(3358\div23=2x-6\)
\(\Rightarrow2x-6=146\)
\(\Rightarrow2x=152\)
\(\Rightarrow x=\frac{152}{2}=76\)
\(\left(2x+1\right)^3=27\)
Mà \(3^3=27\)
Nên \(\left(2x+1\right)^3=3^3\)
\(\Rightarrow2x+1=3\Rightarrow2x=2\Rightarrow x=1\)
\(\left(x-2\right)^3=\left(x-2\right)^2\)
\(\Rightarrow\left(x-2\right)^3-\left(x-2\right)^2=0\)
\(\Rightarrow\left(x-2\right)^2.\left(x-2-1\right)=0\)
\(\Rightarrow\left(x-2\right)^2.\left(x-3\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}}\)
Vậy......................
b) 2x + 15 = -27
2x = -27 - 15
2x = -42
x = -42 : 2
x = -21
c) -765 - (305 + x) = 100
305 + x = -765 - 100
305 + x = -865
x = -865 - 305
x = -1170
d) 2x : 4 = 16
2x = 16 x 4
2x = 64
2x = 26
⇒ x = 6
e) 128 - 3.(x + 4) = 23
3.(x + 4) = 128 - 23
3.(x + 4) = 105
x + 4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31
\(25\div x=x\Leftrightarrow25=x.x\Leftrightarrow25=x^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=-5\\x=5\end{cases}}\)
\(3358\div23=2x-6\)
\(\Leftrightarrow146=2x-6\)
\(\Leftrightarrow2x=152\Leftrightarrow x=76\)
\(2782\div\left[216-\left(x-3\right)\right]=13\)
\(\Leftrightarrow216-\left(x-3\right)=214\)
\(\Leftrightarrow x-3=2\)
\(\Leftrightarrow x=5\)
Trả lời:
Cách 1:
765 . 123 - 765 . 23
= 765 . (123 - 23)
= 765 . 100
= 76500
Cách 2:
765 . 123 - 765 . 23
= 94095 - 17595
= 76500
Hok tốt!
Vuong Dong Yet
Cách 1 : 765x123-765x23
=765(123-23)
=765.100=76500
Cách 2 : 765x123-765x23
=94095-17595
=76500
#Huyền#
765 x 123 - 765 x 23 765 x 123 - 765 x 23
= 765 x ( 123 - 23 ) = 94095 - 17595
= 765 x 100 = 76500
= 76500
chúc bạn học tốt
a) 233 - 23 - 765 - 23 + 213
= (233 - 33 - 23 + 213) - 765
= 390 - 765
= -375
b) 41 + 243 - 344 + (-134)
= 41 + 243 - 344 - 134
= (41 + 243) - (344 + 134)
= 284 - 478
= -194
a/=765x(123-23) b/=2345x(11-1)
=765x100 =2345x10
=76500 =23450
Nhớ k m nha
\(765\cdot123-765\cdot23\)
\(=765\cdot\left(123-23\right)\)
\(=765\cdot100\)
\(=76500\)
\(2345\cdot11-2345\)
\(=2345\cdot11-2345\cdot1\)
\(=2345\left(11-1\right)\)
\(=2345\cdot10\)
\(=23450\)
765 : 27 = 28 (dư 9)
3358 : 23 = 146
765 : 27 = 28 (dư 9)
3358 : 23 = 146 nha
HT