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40x+60(1500-x)＝80000
40x+60*1500-60x=80000
40x+90000-60x=80000
40x-60x=80000-90000
-20x=-10000
20x=10000
x=10000/20
x=5000

2006-11-22 21:47:07 補充：
wrong>3<x=10000/20x=500

４０ｘ＋６０（１５００－ｘ）＝８００００
40x+90000-60x =80000
90000-80000 =60x-40x
10000 =20x
500 =x

４０ｘ＋６０（１５００－ｘ）＝８００００
40x+90000-60x=80000 (拆括號 )

90000-20x=80000(同類項合拼)

-20x= -10000(移乘作除, 負負得正)

x=500

4 0 x + 90000 - 60 x = 80000
- 2 0 x = 80000-90000
- 20 x =-10000
x = -10000/-20
x =500

４０ｘ＋６０（１５００－ｘ）＝８００００
40x + 90000 - 60x = 80000
-20X = -10000
X = 500

４０ｘ＋６０（１５００－ｘ）＝８００００

40x+90000-60x=80000

90000-20x=80000

10000=20x

x=500