b=5/3+5/32 +5/33 +...+5/320+5/321
321- 21. [(2.3^3+4^4 :32)]- 52
2018^0+5^9:5^7-3.7
321- 21. [(2.3^3+4^4 :32)]- 52
=321- 21. [(2.27+256 :32)]- 52
=321-21.[(54+8)]-52
=321-21.62-52
=321-1203-52
=-754
2018^0+5^9:5^7-3.7
=1+25-3.7
=1+25-21
=26-21=5
321- 21. [(2.3^3+4^4 :32)]- 52
=321- 21. [(2.27+256 :32)]- 52
=321-21.[(54+8)]-52
=321-21.62-52
=321-1203-52
=-754
Tính:
a) 217 - 320 : 4;
b) 5052 : 5- 25 : 5
c) 640 : 32 + 32
d) 2180-180:2:9.
a) 217 - 320 : 4 = 217 - 80 = 137
b) 5025 : 5 - 25 : 5 = 1005 - 5 = 1000
c) 640 : 32 + 32 = 20 + 32 = 52
d) 2180 - 180 : 2 : 9 = 2180 - 10 = 2170
Tính:
a) 217 - 320 : 4;
b) 5052 : 5- 25 : 5
c) 640 : 32 + 32
d) 2180-180:2:9
a) 217 - 320 : 4 = 217 - 80 = 137
b) 5025 : 5 - 25 : 5 = 1005 - 5 = 1000
c) 640 : 32 + 32 = 20 + 32 = 52
d) 2180 - 180 : 2 : 9 = 2180 - 10 = 2170
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) \(20\div\left(x+1\right)=\left(5^2+1\right)\div13\)
\(20\div\left(x+1\right)=\left(25+1\right)\div13\)
\(20\div\left(x+1\right)=26\div13\)
\(20\div\left(x+1\right)=2\)
\(x+1=20\div2\)
\(x+1=10\)
\(x=9\)
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) \(70\div\left(x-3\right)=\left(3^4-1\right)\div4-10\)
\(70\div\left(x-3\right)=\left(81-1\right)\div4-10\)
\(70\div\left(x-3\right)=80\div4-10\)
\(70\div\left(x-3\right)=20-10\)
\(70\div\left(x-3\right)=10\)
\(x-3=7\)
\(x=10\)
A) (23)2+(1/2)9÷29
B) 3205/325-35×(2/3)5
320-[32-2.(5-2) mũ 2 ]
A.50 B.306 C.320 D.330
\(320-\left[32-2.\left(5-2\right)^2\right]\)
\(=320-\left[32-2.3^2\right]\)
\(=320-\left[32-2.9\right]\)
\(=320-\left[32-18\right]\)
\(=320-14\)
\(=306\)
\(\Rightarrow B.306\)
Tìm x biết
a/ (x+5)/325 + (x+7)/323 + (x+9)/321 + (x+10)/320 + ... + (x+338)/2 = 0
b/ |5x + 3| > 9
Khoanh vào chữ đặt trước câu trả lời đúng:
Số gồm 5 triệu, 4 chục nghìn, 3 trăm, 2 chục, 1 đơn vị là:
A. 5 400 321 C. 5 004 321
B. 5 040 321 D. 5 430 021
Chứng minh rằng: a, 1/12.22+5/22.32+5/32.42+...+5/92.102 <1 b,1/3+2/32+3/33+...+100/3100 <3/4
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