6+4.(13-x)=240
PT
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tính hợp lý :240÷(5^3-5^3÷5^2)- 3^6÷3^4 +15 x 11x(13 - 9 )
\(240:\left(5^3-5^3:5^2\right)-3^6:3^4+15\cdot11\cdot\left(13-9\right)\)
\(=240:\left(5^3-5\right)-3^{6-4}+15\cdot11\cdot4\)
\(=240\cdot\left(125-5\right)-3^2+60\cdot11\)
\(=240:120-9+60\cdot\left(10+1\right)\)
\(=2-9+600+60\)
\(=653\)
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a.x - 8 : 4 - (46 - 23 .2 + 6 . 3) = 0
b. 240 - (23 + (13+24.3-x)) = 132
1) 2³ .x -5² x = 2( 5² + 2² ) -33. 2) 15÷ ( x +2) = (3³ +3) ÷1
3) 20÷ (x +1) = (5² +1 ) ÷13. 4) 320÷ ( x -1 ) = (5³ - 5² ) ÷4 +15
5) 240 ÷ ( x -5 ) = 2² .5² -20. 6) 70 ÷ ( x -3) = ( 3⁴ -1) ÷ 4 - 10
Giúp mình với mình Tối nay mình đi học rồi
1) \(2^3\times x-5^2\times x=2\times\left(5^2+2^2\right)-33\)
\(x\times\left(2^3-5^2\right)=2\times\left(25+4\right)-33\)
\(x\times\left(8-25\right)=2\times29-33\)
\(x\times-17=25\)
\(x=-\dfrac{25}{17}\)
2) \(15\div\left(x+2\right)=\left(3^3+3\right)\div1\)
\(15\div\left(x+2\right)=\left(27+3\right)\div1\)
\(15\div\left(x+2\right)=30\div1\)
\(15\div\left(x+2\right)=30\)
\(x+2=\dfrac{1}{2}\)
\(x=-\dfrac{3}{2}\)
3) \(20\div\left(x+1\right)=\left(5^2+1\right)\div13\)
\(20\div\left(x+1\right)=\left(25+1\right)\div13\)
\(20\div\left(x+1\right)=26\div13\)
\(20\div\left(x+1\right)=2\)
\(x+1=20\div2\)
\(x+1=10\)
\(x=9\)
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4) \(320\div\left(x-1\right)=\left(5^3-5^2\right)\div4+15\)
\(320\div\left(x-1\right)=\left(125-25\right)\div4+15\)
\(320\div\left(x-1\right)=100\div4+15\)
\(320\div\left(x-1\right)=25+15\)
\(320\div\left(x-1\right)=40\)
\(x-1=8\)
\(x=9\)
5) \(240\div\left(x-5\right)=2^2\times5^2-20\)
\(240\div\left(x-5\right)=4\times25-20\)
\(240\div\left(x-5\right)=100-20\)
\(240\div\left(x-5\right)=80\)
\(x-5=30\)
\(x=35\)
6) \(70\div\left(x-3\right)=\left(3^4-1\right)\div4-10\)
\(70\div\left(x-3\right)=\left(81-1\right)\div4-10\)
\(70\div\left(x-3\right)=80\div4-10\)
\(70\div\left(x-3\right)=20-10\)
\(70\div\left(x-3\right)=10\)
\(x-3=7\)
\(x=10\)
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Tim n thuoc N
a) 3n+13 la so nguyen to
b) 2+4+6+....+2n=240
tìm x
x-8:4-(46-23.2+6.3)=0
240-[23+(13+24.3-x)]=132
(19x+2.5^2):14=(13-8)^2-4^2
(x+3)+3(x+1)=39
240-[23+(13+24.3-x)]=132
240-[23+(13+168-x)]=132
240-[23+(181-x)]=132
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x-8:4-(46-23.2+6.3)=0
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\(x-8:4-\left(46-23.2+6.3\right)=0\)
\(x-2-\left(46-46+18\right)=0\)
\(x-2-18=0\)
\(x-2=0+18\)
\(x-2=18\)
\(x=18+2\)
\(x=20\)
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\(240-\left[23+\left(13+24.3-x\right)\right]=132\)
\(240\left[23+\left(13+82-x\right)\right]=132\)
\(23+\left(95-x\right)=132:240\)
\(23+\left(95-x\right)=\frac{132}{240}=\frac{11}{30}\)
\(23+\left(95-x\right)=\frac{11}{30}\)
\(95-x=\frac{11}{30}-23\)
\(95-x=\frac{11}{30}-\frac{690}{30}\)
\(95-x=-\frac{679}{30}\)
\(x=95+\frac{679}{30}\)
\(x=\frac{2850}{30}+\frac{679}{30}\)
\(x=\frac{3529}{30}=\)tự rút gọn ( nếu có thể )
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giúp mik với : (n x 1 - n / 6 ) x ( 6 + 240 + 4 + 150 )
[2+4+6+ ....+240] x x[111x108-36x333] = ?
8 x 75 x 3 + 6 x 25 x 4 - 240 / 15 x 2 x 6 + 18 x 16 x 5
bằng 3648 nhé
a) 48x0.75-240:10+12x0.5
b) 1/13+12/13x21/17-4/17x12/13
a) 48x0.75-240:10+12x0.5=36-24+6=18
b) 1/13+12/13x21/17-4/17x12/13=1
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