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2 x 1 = 2 | 3 x 1 = 3 | 4 x 1 = 4 | 5 x 1 = 5 |
2 x 2 = 4 | 3 x 2 = 6 | 4 x 2 = 8 | 5 x 2 = 10 |
2 x 3 = 6 | 3 x 3 = 9 | 4 x 3 = 12 | 5 x 3 = 15 |
2 x 4 = 8 | 3 x 4 = 12 | 4 x 4 = 16 | 5 x 4 = 20 |
2 x 5 = 10 | 3 x 5 = 15 | 4 x 5 = 20 | 5 x 5 = 25 |
2 x 6 = 12 | 3 x 6 = 18 | 4 x 6 = 24 | 5 x 6 = 30 |
2 x 7 = 14 | 3 x 7 = 21 | 4 x 7 = 28 | 5 x 7 = 35 |
2 x 8 = 16 | 3 x 8 = 24 | 4 x 8 = 32 | 5 x 8 = 40 |
2 x 9 = 18 | 3 x 9 = 27 | 4 x 9 = 36 | 5 x 9 = 45 |
2 x 10 = 20 | 3 x 10 = 30 | 4 x 10 = 40 | 5 x 10 = 50 |
2x1=2 3x1=3 4x1=4 5x1=5 2:2= 1 3:3= 1 4:4=1 5:5=1
2x2= 4 3x2=6 4x2= 8 5x2=10 4:2= 2 6:3= 2 8:4=2 10:5=2
2x3=6 3x3= 9 4x3=12 5x3=15 6:2=3 9:3= 3 12:4=3 15:5=3
2x4=8 3x4=12 4x4=16 5x4=20 8:2=4 12:3=4 16:4=4 20:5=4
2x5=10 3x5= 15 4x5= 20 5x5= 25 10:2=5 15:3= 5 20:4=5 25:5=5
2x6=12 3x6=18 4x6= 24 5x6=30 12:2=6 18:3= 6 24:4=6 30:5=6
2x7= 14 3x7=21 4x7= 28 5x7=35 14:2=7 21:3=7 28:4=7 35:5=7
2x8=16 3x8=24 4x8= 32 5x8=50 16:2=8 24:3=8 32:4=8 40:5=8
2x9= 18 3x9= 27 4x9= 36 5x9=45 18:2=9 27:3= 9 36:9=9 45:5=9
2x10=20 3x10=30 4x10= 40 5x10=50 20:2=10 30:3=10 40:4= 10 50:5=10
\(a,\sqrt{3^2}-\sqrt{\left(-7\right)^2}+\sqrt{\left(-1\right)^2}\)
\(=3-7+1\)
\(=-3\)
\(b,-2\sqrt{\left(-2\right)^2}+3\sqrt{\left(-5\right)^2}+\sqrt{3^2}\)
\(=-2.2+3.5+3\)
\(=-4+15+3\)
\(=14\)
\(c,\sqrt{\left(2-\sqrt{2}\right)^2}+\sqrt{\left(2+\sqrt{2}\right)^2}\)
\(=\left|2-\sqrt{2}\right|+\left|2+\sqrt{2}\right|\)
\(=2-\sqrt{2}+2+\sqrt{2}\)
\(=4\)
\(d,\sqrt{\left(3-\sqrt{2}\right)^2}-\sqrt{\left(1-\sqrt{2}\right)^2}\)
\(=\left|3-\sqrt{2}\right|-\left|1-\sqrt{2}\right|\)
\(=3-\sqrt{2}-\left(-1+\sqrt{2}\right)\)
\(=3-\sqrt{2}+1-\sqrt{2}\)
\(=-2\sqrt{2}+4\)
5^2 - 2 * 5 * 9 : 2 + ( 9 : 2 )^2 = 25 - 10 * 9 : 2 + 4,5^2 = 25 - 90 : 2 + 20,25 = 25 - 45 + 20,25 = 0,25
4^2 - 2 * 4 * 9 : 2 + ( 9 : 2 )^2 = 16 - 8 * 9 : 2 + 4,5^2 = 16 - 72 : 2 + 20,25 = 16 - 36 + 20,25 = 0,25
A = 12 - 22 + 32 - 42 + 52 - 62 + 72 - .......- 582 + 592
A = 12 + ( 32 - 22) + ( 52 - 42) + (72 - 62) +....+ ( 592 - 582)
A = 1 + ( 3-2)(2+3) + (5-4)(4+5) + (7-6)(6+7)+....+(59-58)(58+59)
A = 1 + 2 + 3 + 4 + 5 + 6 + 7 + ....+ 58 + 59
A = ( 59 + 1).{ (59 - 1): 1 + 1 } : 2
A = 1770
B = \(\dfrac{2^{2016}-2^{2015}+2^{2014}-2^{2013}+2^{2012}-2^{2011}+2^{2010}-2^{2009}}{2^{2008}}\)
Đặt tử số là A
ta có
A = 22016 - 22015+22014 - 22013 + 22012 - 22011 + 22010- 22009
2 A= 22017- 22016 + 22015- 22014 +22013-22012 + 22011 - 22010
2A + A = 22017 - 22009
3A = 22017 - 22009
A = (22017 - 22009):3
B = A : 8 = (22017- 22009) : 3 : 8
B = (22017 - 22009) : 24
=\(\sqrt{\left(\sqrt{2}+1\right)^2}+|\sqrt{2}-2|\)
=\(|\sqrt{2}+1|+2-\sqrt{2}\)
=\(\sqrt{2}+1+2-\sqrt{2}\)
=3