23456 + 123 - 87 x 2 = ????
123+234+345+456+567+678+789+890-23456:456-342+543x45-34567+1234567890+3-23+7:87=????
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the answer is 1234561426.6418633
Tính :
a) 645 - ( 27 + x ) - 342 = 123
b) ! x ! + 87 = 123
c) ! x - 12 ! = 42
a) \(645-\left(27+x\right)-342=123\)
\(\Leftrightarrow\)\(-24-x=123\)
\(\Leftrightarrow\)\(x=123+24=147\)
Vậy...
b) \(\left|x\right|+87=123\)
\(\Leftrightarrow\)\(\left|x\right|=123-87=36\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=36\\x=-36\end{cases}}\)
Vậy....
c) \(\left|x-12\right|=42\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x-12=42\\x-12=-42\end{cases}}\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=54\\x=-30\end{cases}}\)
Vậy...
a) 645 - ( 27 + x ) - 342 = 123
645 - ( 27 + x ) = 123 + 342
645 - ( 27 + x ) = 465
27 + x = 645 - 465
27 + x = 180
x = 180 - 27
x = 53
b) ! x ! + 87 = 123
! x ! = 123 - 87
! x ! = 36
-> x = 36 hoặc x = -36
c) ! x - 12 ! = 42
-> x - 12 = 42 hoặc x - 12 = -42
Nếu x - 12 = 42 thì ta có : Nếu x - 12 = -42 thì ta có :
x = 42 + 12 x = -42 + 12
x = 54 x = -30
a, => 645-27-x-342=123
=> 276-x=123
=> x=276-123 = 153
x + 98 = 123
x - 21 = 87
x + 98 = 123
x = 123 - 98
x = 25
~~~~~~~~~~~~~~~~
x - 21 = 87
x = 87 + 21
x = 108
x + 98 = 123
x = 123 - 98
x = 25
x - 21 = 87
x = 87 + 21
x = 108
1.Tính 1 cách hợp lí
a)3119.121-3119.11.11
b)24.(123+87)+(87+123).76
a) \(3119\cdot121-3119\cdot11\cdot11\\ =3119\left(121-11\cdot11\right)\\ =3119\left(121-121\right)\\ =3119\cdot0=0\)
b) \(24\cdot\left(123+87\right)+\left(87+123\right)\cdot76\\ =\left(123+87\right)\left(24+76\right)\\ =210\cdot100=21000\)
Anh em ơi giúp mik với
Tính nhanh
(-123).(87-53)-53.(123-87)
Lời giải:
$(-123)(87-53)-53(123-87)$
$=-123.87+123.53-53.123+53.87$
$=(-123.87+53.87)+(123.53-53.123)$
$=87(53-123)+0=87(-70)=-6090$
=24.210+210.76
=(24+76).210
=100.210
=21000
Tính một cách hợp lí a,3119×121-3119×11×11,b,24×(123+87)+(87×123)×76
a) \(3119\cdot121-3119\cdot11\cdot11\)
\(=3119\cdot121-3119\cdot\left(11\cdot11\right)\)
\(=3119\cdot121-3119\cdot121\)
\(=3119\left(121-121\right)\)
\(=0\)
b) \(24\cdot\left(123\cdot87\right)+\left(87\cdot123\right)\cdot76\)
\(=\left(123\cdot87\right)\cdot\left(76+24\right)\)
\(=\left(123\cdot87\right)\cdot100\)
\(=1070100\)
Cần gấp!!!!
23456
(23457)^2 - (23456 x 23458 )
Tặng 3 tick .
123. (125.127- 125 .87) +87.125.123 -123 .125.126
123. (125.127- 125 .87) +87.125.123 -123 .125.126
=123. [125.(127-87)] +87.125.123 -123 .125.126
=123. (125.40) +87.125.123 -123 .125.126
=123.5000 +10875.123 -123 .15750
=123.(5000+10875-15750)
=123.125
=15375