www.ndwl.net > 求未知数x.(1)4x+0.8x=9.6(2)x:

求未知数x.(1)4x+0.8x=9.6(2)x:

(4x-1.5)/0.5-(5x-0.8)/0.2=(1.2-x)/0.1 2(4x-1.5)-5(5x-0.8)=10(1.2-x) 8x-3-25x+4=12-10x -17x+1=12-10x 17x-10x=1-12 7x=-11 x=-11/7

做了图片

由g(x)=2x2-4x-16<0,得x2-2x-8<0,即(x+2)(x-4)<0,解得-2<x<4.所以不等式g(x)<0的解集为{x|-2<x<4};(2)因为f(x)=x2-2x-8,当x>2时,f(x)≥(m+2)x-m-15成立,则x2-2x-8≥(m+2)x-m-15成立,即x2-4x+7≥m(x-1).所以...

1、0.4x(2.5-0.25)+2.9 =2.5*0.4-0.4*0.25+2.9 =1-0.1+2.9 =3.9-0.1 =3.8 2、1.25-1.25x0.8 =1.25*(1-0.8) =1.25*0.2 =0.25 3、11.25+11.25x0.8 =11.25*2-11.25*0.2 =22.5-2.25 =20.25 4、(0.25+2.5+25)x0.8 =(0.25+2.5+25)-(0.25+2.5+25...

我咋觉得有x^4呢 确定答案准确吗 我觉得是48x^4 (x+1)(2x+2)(3x+3)(4x+4)+(x-3)(2x+2)[(3x+1)(4x+4)-8] 提四次方项 即可

0.25x(4x1.2)+1.25x(8÷0·5) =0.25x4x1.2+1.25x8÷0.5 =1.2+10x2 =1.2+20 =21.2

第二题不全哇~ 检验的时候,将算出来的数,带入方程左边即可。 不懂请追问。

4x-0.4=0.8, 4x=0.8+0.4, 4x=1.2, x=1.2÷4, x=0.3,

(1)题的过程: 由x+y-z=0可得z=x+y,代入剩余两个方程可得:2x-y+3(x+y)=2,x-4y-2(x+y)+6=0,整理得:5x+2y=2, x+6y=6(这个式子可以两边同乘5得:5x+30y=30),由5x+2y=2,5x+30y=30两式相减消去5x,可得28y=28,y=1,再由x+6y=6(或5x+2y=2)可得x...

19.4×(6+0.1)+2.3=19.4×6+19.4×0.1+2.3=(20-0.6)×6+2.3 5.67×(0.2+0.01)-0.62 0.8×(4+0.3)+1.25

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