L=(1x2+2x1x2x2+3x1x2x3+4x1x2x4+5x1x2x5)/(3x4+2x3x4x2+3x3x4x3+4x3x4x4+5x3x4x5)
L=(1+2x2+3x3+4x4+5x5)(1x2)/(1+2x2+3x3+4x4+5x5)(3x4)
L=(1x2)/(3x2x2)
L=1/6
tính nhanh
1x2+2x43x6+4x8+5x10/3x4+6x8+9x12+12x16+15x20
2x4+4x8+8x12+12x16+16x20
1x2+2x4+4x6+6x8+8x10
tính nhanh
A= 22+42+62+...+2002
B= 1x3+3x5+5x7+...+99x101
C= 2x4+4x6+6x8+...+98x100x102
D= 1x2+3x4+5x6+...+99x100
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1/5x10 + 1/10x15 + 1/15x20 +...+1/95x100
Tính nhanh:
A= 1/2+1/2^2+1/2^3+....+1/2^100
B=3^2/2x4+3^2/4x6+3^2/6x8+....+3^2/198x200
C=\(\frac{\frac{2017}{1}+\frac{2017}{2}+\frac{2017}{3}+...+\frac{2017}{2017}}{\frac{2016}{1}+\frac{2015}{2}+\frac{2014}{3}+...+\frac{1}{2016}}\)
D=1x2+2x3+3x4+4x5+...+48x49
E=\(^{1^2+2^2+3^2+...+48^2}\)
F=1x49+2x48+3x47+...+48x2+49x1
Bài 1: tính:
A=3x4+4x5+5x6+...+58x59+59x60
Bài 2: Tính:
A=2x4+4x6+6x8+...+96x98+98x100
bài 3: tính:
B=2x3+5x8+8x11+...+89x92+92x95
bài 4: tính:
C=3x4x5+4x5x6+5x6x7+...+20x21x22+21x22x23
bài 5: tính:
C=2x4x6+4x6x8+...+20x22x24+22x24x26
bài 6: tính:
C=1x4x7+4x7x10+...+21x24x27+24x27x30
bài 7: tính:
A=3x7x11+7x11x15+...+23x27x31+27x31x35
bài 8: tính:
A=1x4+3x6+5x8+...+47x50+49x52
bài 9: tính:
A=1+3+6+10+...+4851+4950
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CỐ LÊN...
A=1x2+2x3+3x4+...+49x50
B=1x3+3x5+5x7+...+99x101
C=1x2x3+2x3x4+3x4x5+...+50x51x52
D=1x4+2x5+3x6+...+60x63
E=1x1+2x2+3x3+...+50x50
F=1x1+3x3+5x5+...+71x71
G=1x1+4x4+7x7+...+100x100
I=1x2x3+3x4x5+5x6x7+...+69x70x71
A=2x4+4x6+6x8+....+98x100
S=2x4+4x6+6x8+...+98x100+100x102
