有2道解方程的题,0.2X+0.45 0.015+0.01X1.————— - ——————=0.5X-2.50.25 0.0152.2X-1/2[X-1/2(X-1)]=1/3(X-1)0.2X+0.45/0.25-0.015+0.01X/0.015=0.5X-2.5
2019-05-28
有2道解方程的题,
0.2X+0.45 0.015+0.01X
1.————— - ——————=0.5X-2.5
0.25 0.015
2.2X-1/2[X-1/2(X-1)]=1/3(X-1)
0.2X+0.45/0.25-0.015+0.01X/0.015=0.5X-2.5
优质解答
写题要加括号……
1.先约分,得到:
(4X+9)/5-(2X+3)/3=0.5X-2.5
去分母,整理 55X=495
X=9
2.从外向内去括号.
4X-[X-1/2(X-1)]=2/3(X-1)
3X+1/2(X-1)=2/3(X-1)
18X+3X-3=4X-4
X=-1/17
写题要加括号……
1.先约分,得到:
(4X+9)/5-(2X+3)/3=0.5X-2.5
去分母,整理 55X=495
X=9
2.从外向内去括号.
4X-[X-1/2(X-1)]=2/3(X-1)
3X+1/2(X-1)=2/3(X-1)
18X+3X-3=4X-4
X=-1/17