2-by-4

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2-by-42-by-42-by-42-by-4inch=2inch*4inch=5.08厘米*10.16厘米如果是三个数字2-4-4,最后那个就是高度4其实一般会有注释,比如2L*4W*4H,意思是

2-by-4
2-by-4

2-by-4
2-by-4 inch = 2inch * 4inch = 5.08厘米 * 10.16厘米
如果是三个数字 2-4-4,最后那个就是高度4
其实一般会有注释,比如2L*4W*4H,意思是 length=2 width=4 height=4 分别代表长宽高

这是对一个长方形尺寸的描述 2X4英寸也就是长4英寸宽2英寸
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后来者请勿给出与我雷同的答案谢谢配合鄙视抄袭

2-by-4 8-by-2by-1/4-inch是什么意思求代数式2（ax+by）(by-ax)-(ax+by)²-(ax-by)²的值,其中a=-4,a-x=-1. 实数a,b,x,满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,ax^5+by^5=? 若a,b,x,y满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+by^5的值若a,b,x,y满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+by^5的值已知ax+by=7 ax²+by²=49 ax³+by³=133 ax^4+by^4=406已知ax+by=7 ax²+by²=49 ax³+by³=133 ax^4+by^4=406(1)求a+b ,x+y,xy的值（2)请问ax^5+by^5的值是有理数吗?（2)请问ax^5+by^5的值是有理数吗？ order by 2 desc by by by by by by by by by by