1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
把下面的等式改写成比例.(1)3X40=8X15 (2)5分之3X7分之4=5分之4X7分之3
1x2/1+2x3/1+3x4/1+4x5/1+5x6/1+6x7/1
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7
2/7X7=4分之1X7分之5+4分之1X7分之2+4分之1 98除以(15分之1除以7分之2)
-10.5x(-6分之1-4分之1)x7分之3除以(-0.5)
1+2X3+4X5+6X7+8X9=303
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看
计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
2/1X3+2/3X5+2/5x7+.+2/19x21
编写一个程序,计算x-1/2*x3/4+1/2*3/4*x5/6-1/2*3/4*5/6*x7/8+.的近似值