外贸?3'x8'x 1 3/4"是什么,见下Our company is looking to purchase 1,000 Interior 3'x8'x 1 3/4" thickness heavy doors 请问这个规格是什么呢,

外贸白痴问题,3'x8'x 1 3/4 thickness 是什么Our company is looking to purchase 1,000 Interior 3'x8'x 1 3/4 thickness heavy doors 3'x8'x 1 3/4 thickness 主要问这个,这里的3'x8'x 1 3/4是什么东西, 外贸?3'x8'x 1 3/4是什么,见下Our company is looking to purchase 1,000 Interior 3'x8'x 1 3/4 thickness heavy doors 请问这个规格是什么呢, 3x8+4x8+5x8+6x8+7x8+8x8+9x8+10x8 的简便运算 1x8+1=9,12x8+2=98,123x8+3=987,1234x8+4=9876照样子继续四道这样的题? （-5/12)x8/15x3/2x(-2/3)x0x(-1)= (-1)x(-5/4)x8/15x3/2x(-2/3)x0x(-1)= 的计算过程.（-5/12)x8/15x1/2x(-2/3) 5x（-4）-3x（-2）-（3-7）x8分之1 （-1/12）x8/15x(-2/3)x（-9/4）怎么计算呀 1X8+1=9,12X8+2=98,123x8+3=987,1234x8+4=9876找规律把下面,□填上数字□x8+□=□,□x8+□=□,□x8+□=□,□x8+□=口 3x(1/2—5/6—3/4+7/12)x8 (-5)x8x(-7)x(-0.25)= （-5/12)x8/15x3/2x(-2/3)x0x(-1)= (-1)x(-5/4)x8/15x3/2x(-2/3)x0x(-1)= (7.5/1+5/1)+5/1(x-1)=1 80/xX2+80/x+5 x8=4/3 找规律：1x8+1=9 12x8+2=98 123x8+3=987……123456x8+6=? X8（次方）+X+1 因式分解X8+X+1 当x-1/x=3时,(x10+x8+x2+1)/(x10+x6+x4+1)= 3X8+8x=360/4-5x 解方程 电气母线计算TMY-3x2(80x8)+1x(80x8)请问这个式子代表的什么含义,详细说下. 2.5x8—2.4x=10.4 0.8x（x+0.8）=0.8 3x（x+2）=4x（x+1）解方2.5x8—2.4x=10.40.8x（x+0.8）=0.83x（x+2）=4x（x+1）解方成要过成全能答几个算几个,全答采纳.速度 1X2+2X4+3X8+.N X 2的N次方=?