（1+20）*10
1x2x3x4x5x6x……x19x20
8个回答
相关问题
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(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
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观察下列单项式：1/2x,-2/3x^2,3/4x^3,-4/5x^4,5/6x^5,…,19/20x^19,-20/2
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3x4+4x5+5x6+.19x20+20x21=?
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5/(1x2x3x4)+7/(2x3x4x5)+9/(3x4x5x6)+...+37/(17x18x19x20)
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1.下列单项式：-x,2x^2,-3x^3,4x^4,…,-19x^19,20x^20,…
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1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.+1/18x19+1/19x20 计算方法与结果
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-①4.1x+221.4=4.25x+216 ②43-2(5+3)=3+6(x-1) ③27=x2[19+(20-x)]
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1x2/1+2x3/1+3x4/1+4x5/1.19x20/1
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解方程：（1）2x-19=7x+31 (2)20-2x=x-1 (3)19-x=100-10x (4)1/3x+5=2/
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1x2+2x3+3x4+.+19x20