[(x+2.5)^2-4.5^2][(x+2.5)^2-1.5^2]=19 记y=(x+2.5)^2则 y^2-(45/2)y+(27/4)^2=19 (y-45/4)^2=100 y=85/4y=-5/4(此根舍去)x=(-5+√85)/2或x=(-5-√85)/2
解：把方程左边第一个因式与第四个因式相乘，第二个因式与第三个因式相乘，得 （x2+5x-14）（x2+5x+4）=19．设y=(x2+5x-14)+ (x2+5x+4) 2=x2+5x-5，① 则（y-9）（y+9）=19，即y2-81=19．解得y1.2=±10，将y1、y2的值代入①式得，x1.2=-5±√852，x3.4=...
[(x-2)(x+7)]*[(x+1)(x+4)]=19 (x平方+5x-14)*(x平方+5x+4)=19 设x平方+5x=a,则 (a-14)(a+4)=19 a平方-10a-56=19 a平方-10a-75=0 (a-15)(a+5)=0 所以:a=15 或者 a=-5 则 x平方+5x=15或者 x平方+5x=-5 到这里就会算了撒!
[(x-2)(x+7)]*[(x+1)(x+4)]=19 (x平方+5x-14)*(x平方+5x+4)=19 设x平方+5x=a,则 (a-14)(a+4)=19 a平方-10a-56=19 a平方-10a-75=0 (a-15)(a+5)=0 所以:a=15 或者 a=-5 则 x平方+5x=15或者 x平方+5x=-5 看不懂看下面那个 望采纳哦~
(GX2CrNiMoN26-7-4)热轧板;依厚度不同又有1.4469 (GX2CrNiMoN26-7-4)薄钢板_1.4469 (GX2CrNiMoN26-7-4)中板_1.4469 (GX2CrNiMoN26-7-4)厚板_1.4469 (GX2CrNiMoN26-7-4)特厚板之说;千奇百怪的叫法不仅仅是从常规理解上体现还体现在1.4469 (GX2CrNiMoN26-7-4)化学成分/硬度/密度等性能的...
a,b,c,32,25.5,440.5,442,1,0.5,7,13.5,20,395,279,2,0,7,-14 a,b,c,24,19,366,319,1,2,7,31,24,436.5,306,1,2,7,-14 a,b,c,10,12,270.5,214.5,3.5,0.5,7,14,16.5,319.5,300,2.5,2,7,7 a,b,c,12.5,25.5,257.5,324.5,4,2,7,19.5,24,340.5,317.5,1,2,7,-13 ...
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【解析】【答案】(1)x=93,(2)x=17,(3)=16.【解析】(1)7(+19)=784x+19=784÷72+19=112=112-19=934(x-4)-3(x-3)=104x-16-3+9=10(34x-3-7=10x-7=10x=10+7=173(x-2)-2(x-3)=163-6-2x+6=163-2=16=16【方程的解定义】使方程左右两边相等的未知数的值,叫做...
resolution4 6.7 -inch5 OLED curved screen 19.8:9 aspect ratio *Simulated image for illustration purposes. 60Hz 120Hz True Billion Colour Display Colours Galore Find X2 series brings visuals to life with over 1 billion colours (8+2-bit) – 64 times the typical number (8-bit). Now, colour...
Investigating superconductivity represents one of the most significant phenomena in the field of condensed matter physics. Our simulations aim to elucidate the structures in the metallic state of Mg1−xMoxB2, which is essential for predicting their sup