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(1+1+1)! = 3! = 6
2+2+2=6
3x3-3=6
\(\sqrt{4}+\sqrt{4}+\sqrt{4}=6\)
5:5+5=6
6+(6-6)=6
7-7:7=6
\(8-\sqrt{\sqrt{8+8}}=6\)
\(\sqrt{9}.\sqrt{9}-\sqrt{9}=6\)
`5)(6-sqrt6)/(1-sqrt6)+(6-sqrt6)/sqrt6=(sqrt6(sqrt6-1))/(1-sqrt6)+(sqrt6(sqrt6-1))/sqrt6=-sqrt6+sqrt6-1=-1` $\\$ `6)1/(sqrt2-sqrt3)-1/(sqrt3+sqrt2)=(sqrt2+sqrt3)/(2-3)-(sqrt3-sqrt2)/(3-2)=-(sqrt2+sqrt3)-sqrt3+sqrt2=-2sqrt3` $\\$ `7)1/(sqrt5+sqrt3)-1/(sqrt5-sqrt3)=(sqrt5-sqrt3)/(5-3)-(sqrt5+sqrt3)/(5-3)=(sqrt5-sqrt3-sqrt5-sqrt3)/2=-sqrt3` $\\$ `8)6/(1-sqrt3)-(3sqrt3-3)/(sqrt3+1)=(6(1+sqrt3))/(1-3)-(3(sqrt3-1)^2)/(3-1)=(-6(sqrt3+1)-3(4-2sqrt3))/2=-9`
kết quả lần lượt là : 2,4,6,8,10,12,14,16,18
mik chắc chắn 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000@
\(\left(1+1+1\right)!=6.\)
\(2+2+2=6\)
\(3.3-3=6\)
\(\sqrt{4}+\sqrt{4}.\sqrt{4}=6\)
\(5+5\div5=6\)
\(6.6\div6=6\)
\(7-7\div7=6\)
\(\sqrt{8+8\div8}!=6\)
\(\sqrt{9}.\sqrt{9}-\sqrt{9}=6\)
\(\sqrt{10-10\div10}!\)
14dm5cm=14,5dm;3dm7cm=3,7dm
chu vi hình chữ nhật đó là:
(14,5+3,7)x2=36,4(dm)
ĐS:36,4dm
14 dm 5 cm = 14,5 dm
3 dm 7 cm = 3,7 dm
Chiều rộng HCN là :
14,5 - 3,7 = 10,8 ( dm )
chu vi HCN là :
( 14,5 + 10,8 ) x 2 = 50,6 ( dm )
ĐS:..
9+9+9+9=36 ( 9x4=36 )
6+6+6+6=24 ( 6x4=24 )
7+7+7+7=28 ( 7x4=28 )
6, \(\frac{\sqrt{x}-1}{\sqrt{x}+1}-\frac{\sqrt{x}+3}{\sqrt{x}-2}-\frac{x+5}{x-\sqrt{x}-2}\)ĐK : \(x\ge0;x\ne4\)
\(=\frac{\left(\sqrt{x}-1\right)\left(\sqrt{x}-2\right)-\left(\sqrt{x}+3\right)\left(\sqrt{x}+1\right)-x-5}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)}\)
\(=\frac{x-3\sqrt{x}+2-x-4\sqrt{x}-3-x-5}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)}=\frac{-x-7\sqrt{x}-6}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)}\)
\(=\frac{-\left(\sqrt{x}+1\right)\left(\sqrt{x}+6\right)}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)}=\frac{-\sqrt{x}-6}{\sqrt{x}-2}\)
7, \(\frac{\sqrt{x}+2}{\sqrt{x}-3}-\frac{\sqrt{x}+1}{\sqrt{x}-2}-\frac{3\sqrt{x}-3}{x-5\sqrt{x}+6}\)ĐK : \(x\ge0;x\ne4;9\)
\(=\frac{x-4-\left(\sqrt{x}+1\right)\left(\sqrt{x}-3\right)-3\sqrt{x}+3}{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}\)
\(=\frac{x-4-x+2\sqrt{x}+3-3\sqrt{x}+3}{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}=\frac{-\sqrt{x}+2}{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}=\frac{1}{\sqrt{x}-3}\)
9, \(\frac{3\sqrt{x}+2}{2\sqrt{x}-1}+\frac{\sqrt{x}-1}{\sqrt{x}+4}-\frac{x-6\sqrt{x}+5}{2x-7\sqrt{x}-4}\)ĐK : \(x\ge0;x\ne\frac{1}{4}\)
\(=\frac{\left(3\sqrt{x}+2\right)\left(\sqrt{x}+4\right)+\left(\sqrt{x}-1\right)\left(2\sqrt{x}-1\right)-x+6\sqrt{x}-5}{\left(2\sqrt{x}-1\right)\left(\sqrt{x}+4\right)}\)
\(=\frac{3x+14\sqrt{x}+8+2x-3\sqrt{x}+1-x+6\sqrt{x}-5}{\left(2\sqrt{x}-1\right)\left(\sqrt{x}+4\right)}\)
\(=\frac{4x+17\sqrt{x}+4}{\left(2\sqrt{x}-1\right)\left(\sqrt{x}+4\right)}=\frac{\left(\sqrt{x}+4\right)\left(4\sqrt{x}+1\right)}{\left(2\sqrt{x}-1\right)\left(\sqrt{x}+4\right)}=\frac{4\sqrt{x}+1}{2\sqrt{x}-1}\)
8, bạn tự làm nhé