Ôn tập chương 1
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Các câu hỏi tương tự
a , x+1/2=25:23
b , 2/3+5/3x=5/7
c , |x+5|-6=9
d , -12/13x-5=6 1/13
Tìm x:
1) -3.(1-2x) - 4.(1+3x) = -5x + 5
2) 3.(2x - 5) - 6.(1 - 4x) = -3x + 7
3) (1 - 3x) - 2.(3x - 6) = -4x - 5
4) x.(4x - 3) - 2x.(2x - 1) = 5x - 7
5) 3x.(2x - 1) - 6x.(x + 2) = -3x + 4
6) (1 - 2x).3 - 4.(6x - 1) = 7x - 5
7) 6x - 3.(1 - 4x) - 5.(x + 1) = 2x + 7
8) 6.(1 - 3x) - 3.(2x + 5) = -10x + 7
9) 3x.(1 - 2x) + 6x^2 - 7x = 8.(1 - 2x) - 9
10) 2x.(1 + 3x) - 3x.(4 + 2x) = 3x - 4
a,2^12.3^54^6.81/(2^2.3)^6+8^4.3^5
b, 4.(-1/2)^3-2.(-1/2)^2+3.(-1/2)+1
c, 5x-7=3x+9
d, 5x-|9-7x|=3
e, -5+|3x-1|+6=|-4|
g, (x-1)^2=(x-1)^4
h, 5^-1.25=125
i, |x+1|+|x+2|+|x+3|=4x
a) Tính giá trị biểu thức sau:
dfrac{9^4.8^6}{6^{10}.16^3}
b) Tìm x:
1/ left(dfrac{4}{5}x-1right).left(6x+dfrac{1}{2}right)0
2/
left(2x+1right)^225
3/
x:8,50,69:(-1,15)
4/
3(3x+5)-2(6-2x)10
5/
sqrt{x}2,5
6/
3^{X-1}+5.3^{x-1}162
7/
dfrac{X-5}{1}+dfrac{X-5}{2}+dfrac{X-5}{3}+dfrac{X-5}{4}0
Đọc tiếp
a) Tính giá trị biểu thức sau:
\(\dfrac{9^4.8^6}{6^{10}.16^3}\)
b) Tìm x:
1/ \(\left(\dfrac{4}{5}x-1\right).\left(6x+\dfrac{1}{2}\right)=0\)
2/
\(\left(2x+1\right)^2=25\)
3/
x:8,5=0,69:(-1,15)
4/
3(3x+5)-2(6-2x)=10
5/
\(\sqrt{x}=2,5\)
6/
\(3^{X-1}+5.3^{x-1}=162\)
7/
\(\dfrac{X-5}{1}+\dfrac{X-5}{2}+\dfrac{X-5}{3}+\dfrac{X-5}{4}=0\)
Chung minh:
a/ \(5^5-5^4+5^3⋮7\)
b/ \(7^6+7^5-7^4⋮11\)
c/ \(3^{x+2}-2^{x+3}+3^x-2^{x+1}⋮10\)
d/ \(3^{x+3}+3^{x+1}+2^{x+3}+2^{x+2}⋮6\)
tìm x biết
1)left(1-2xright)^29
2)left(x+5right)^3-64
3)left(3x-5right)^216
4) left(x-1right)^327
5)x^2+x0
6)5^{x+2}625
7) 5-left|3x-1right|3
8) left|2x-1right|+54
9)left|dfrac{1}{3}-xright|-1dfrac{2}{3}
Đọc tiếp
tìm x biết
1)\(\left(1-2x\right)^2=9\)
2)\(\left(x+5\right)^3=-64\)
3)\(\left(3x-5\right)^2=16\)
4) \(\left(x-1\right)^3=27\)
5)\(x^2+x=0\)
6)\(5^{x+2}=625\)
7) \(5-\left|3x-1\right|=3\)
8) \(\left|2x-1\right|+5=4\)
9)\(\left|\dfrac{1}{3}-x\right|-1=\dfrac{2}{3}\)
BÀI 1:Tính bằng cách hợp lý nhất: | BÀI 2:Tìm x biết:
a) 1frac{4}{23}+frac{5}{21}-frac{4}{23}+0,5+frac{16}{21} ; | a) |x+5|-69
b) 23frac{1}{4}.frac{7}{5}-13frac{1}{4}:frac{5}{7} ; | b) left(x-1right)^225
c) frac{2^4.2^6}{left(2^5right)^2}-frac{2^5.15^3}{6^3.10^2} |
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Đọc tiếp
BÀI 1:Tính bằng cách hợp lý nhất: | BÀI 2:Tìm x biết:
a) 1\(\frac{4}{23}\)+\(\frac{5}{21}\)-\(\frac{4}{23}\)+0,5+\(\frac{16}{21}\) ; | a) |x+5|-6=9
b) \(23\frac{1}{4}\).\(\frac{7}{5}\)-13\(\frac{1}{4}\):\(\frac{5}{7}\) ; | b) \(\left(x-1\right)^2=25\)
c) \(\frac{2^4.2^6}{\left(2^5\right)^2}-\frac{2^5.15^3}{6^3.10^2}\) |
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BÀI 3:Tìm x biết:
a) \(\frac{x}{12}-\frac{5}{6}=\frac{1}{12}\) e) \(1\frac{1}{2}.x-4=0,5\)
b) \(\frac{2}{3}-1\frac{4}{15}x=\frac{-3}{5}\) f) 2x-1 =16
c) -23 +0.5x=1.5 g) (x-1)2 =25
d) \(\frac{\left(-3\right)^x}{81}=27\) h) |2x-1|=5
tìm x biết
1) dfrac{2}{3}+dfrac{1}{3}:xdfrac{3}{5}
2) left(dfrac{2x}{3}-3right):left(-10right)dfrac{2}{5}
3) 2dfrac{2}{3}:x2dfrac{1}{12}:left(-0,06right)
4) dfrac{3}{7}+dfrac{1}{7}:xdfrac{3}{14}
5) -dfrac{3}{5}.x-dfrac{1}{2}-dfrac{1}{7}
6) dfrac{1}{5}+2x-2dfrac{1}{4}
7)-dfrac{1}{2}:xdfrac{3}{8}:dfrac{9}{16}
8)dfrac{2}{3}:x2dfrac{1}{2}:left(-0,3right)
9) dfrac{x}{3}dfrac{-2}{1,5}
Đọc tiếp
tìm x biết
1) \(\dfrac{2}{3}+\dfrac{1}{3}:x=\dfrac{3}{5}\)
2) \(\left(\dfrac{2x}{3}-3\right):\left(-10\right)=\dfrac{2}{5}\)
3) \(2\dfrac{2}{3}:x=2\dfrac{1}{12}:\left(-0,06\right)\)
4) \(\dfrac{3}{7}+\dfrac{1}{7}:x=\dfrac{3}{14}\)
5) \(-\dfrac{3}{5}.x-\dfrac{1}{2}=-\dfrac{1}{7}\)
6) \(\dfrac{1}{5}+2x=-2\dfrac{1}{4}\)
7)\(-\dfrac{1}{2}:x=\dfrac{3}{8}:\dfrac{9}{16}\)
8)\(\dfrac{2}{3}:x=2\dfrac{1}{2}:\left(-0,3\right)\)
9) \(\dfrac{x}{3}=\dfrac{-2}{1,5}\)
Tìm x
a.|x|-7,4=2,6
b.|x|=3,9
c.|x|+2/3+7/6=13/6 CHÚ Ý:"/'' LÀ CHỈ PHẦN .VD
d.|4^x+2|=2^6 5/6 ĐỌC LÀ NĂM PHẦN SÁU
e.|x^9|=8^3
a) dfrac{2}{3}x + 0,25 -dfrac{5}{8} - left(dfrac{1}{2}-dfrac{3}{4}xright)
b) ( 9x^2 -1 ) . ( 2x + 3 ) 0
c) left|2x-dfrac{1}{3}right|-dfrac{3}{4}left|-dfrac{5}{6}right|
d) left(0,75-dfrac{5}{6}xright)^3 -dfrac{27}{64}
e) left(dfrac{2}{5}x-dfrac{1}{2}right)^2dfrac{9}{16}
f) dfrac{2x-3}{3}dfrac{3x+2}{7}
h)left(dfrac{2}{3}right)^{2x+1} left(dfrac{8}{27}right)^3
i) 2.5^{3x}+5^{3x+2}3375
Đọc tiếp
a) \(\dfrac{2}{3}\)x + 0,25 = \(-\dfrac{5}{8}\) - \(\left(\dfrac{1}{2}-\dfrac{3}{4}x\right)\)
b) ( \(9x^2\) -1 ) . ( 2x + 3 ) = 0
c) \(\left|2x-\dfrac{1}{3}\right|-\dfrac{3}{4}=\left|-\dfrac{5}{6}\right|\)
d) \(\left(0,75-\dfrac{5}{6}x\right)^3\) = \(-\dfrac{27}{64}\)
e) \(\left(\dfrac{2}{5}x-\dfrac{1}{2}\right)^2=\dfrac{9}{16}\)
f) \(\dfrac{2x-3}{3}=\dfrac{3x+2}{7}\)
h)\(\left(\dfrac{2}{3}\right)^{2x+1}\) = \(\left(\dfrac{8}{27}\right)^3\)
i) \(2.5^{3x}+5^{3x+2}=3375\)