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\(x⋮12;25;30\Rightarrow x\in BC\left(12;25;30\right)\)
\(12=2^2.3;25=5^2;30=2.3.5\)
\(BCNN\left(12;25;30\right)=2^2.3.5^2=300\)
\(BC\left(12;25;30\right)=B\left(300\right)\)
\(B\left(300\right)=\left\{0;300;600;....\right\}\)
\(0\le x\le500\Rightarrow x=300\)
\(\left(3x-2^4\right).7^3=2.7^4\)
\(\left(3x-16\right)=2.7\)
\(3x-16=14\)
\(3x=30\)
\(x=10\)
\(\left|x-5\right|=16+2.\left(-3\right)\)
\(\left|x-5\right|=10\)
\(\Leftrightarrow x-5=10\Rightarrow x=15\)
\(\Leftrightarrow x-5=-10\Rightarrow x=-5\)
a.\(12^7:6^7=\left(12:6\right)^7=2^7\)
b. \(27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3\)
c. \(18^3:9^3=\left(18:9\right)^3=2^3\)
d. \(125^3:25^4=\left(25^3\right)^3:25^4=25^9:25^4=25^5\)
12^7:6^7=(12:6)^7=2^7
27^5:81^3=(3^3)^5:(3^4)^3=3^15:3^12=3^3
18^3:9^3=(18:9)^3=2^3
125^3:25^4=(5^3)^3:(5^2)^4=5^9:5^8=5
a/ 100 : { 2. [ 52 - ( 35 - 8 )]}
= 100 : { 2. [ 52 - 27 ]}
= 100 : { 2. 25 }
= 100 : 50
= 2
b/ 12 : { 390 : [ 500 - ( 125 + 35 . 7 )]}
= 12 : { 390 : [ 500 - ( 125 + 245 )]}
= 12 : { 390 : [ 500 - 370 ]}
= 12 : { 390 : 130 }
= 12 : 3
= 4
c/ 3. 52 - 16 : 22
= 3 . 25 - 16 : 4
= 75 - 4
= 71
Bài này dễ mà
a)A= \(\frac{17.(145-236-111)}{202.(34-178+127)}\)
=\(\frac{17.(-202)}{202.(-17)}\)
=\(1\)
a) 31 . 65 + 31 . 35 - 500
=31(65+35)-500
=31..100-500
=3100-500
=2600
a) 168 + 74 + 332 + 226
= ( 168 + 332 ) + ( 226 + 74 )
= 500 + 300
= 800
b) 34 . 32
= 34 + 2
= 36
c) 25 : { 650 : [ 500 - ( 135 + 7 . 35 ) ]}
= 25 : { 650 : [ 500 - ( 135 + 245 )]}
= 25 : { 650 : [ 500 - 380 ]}
= 25 : { 650 : 120 }
= 25 : 5,41
= 4,621
=
\(\text{168 + 74 + 332 + 226}\)
\(=\left(168+332\right)+\left(74+226\right)\)
\(=500+300\)
\(=800\)
\(3^4:3^2\)
\(=3^2\)