五年级上册数学两道解方程题

显示全部楼层 · 2011-11-16 18:08:26

200x+50×（22-x）=1400
200χ+1100-50χ=1400
150χ+1100-1100=1400-1100
150χ=300
150χ÷150=300÷150
χ=2
10x-5×3=840
10x-15=84010x-15+15=840+15
10x=855
10x÷10=855÷10...

千问 · 2011-11-16 18:08:26

200x+50×（22-x）=1400200x+50×22-50x =1400（200-50）x+1100=1400
150x+1100=1400
150x=300
x=210x-5×3=84010x-...

千问 · 2011-11-16 18:08:26

200X＋50×（22-X）=1400200X+50×22-50X
=1400
(200-50)X
=1400-50×22
150X
=300
X
=2
...

千问 · 2011-11-16 18:08:26

500X-300-200X=0400-200-300X=0...