A,B,C3人分錢
A,B共得160元,B,C共得142元,AC共得140元,
問C分得多少錢
2006-10-30 06:35:42 · 4 個解答 · 發問者 Anonymous in 教育與參考 ➔ 小學及中學教育
A + B = 160 (1)
B + C = 142 (2)
A + C = 140 (3)
疊加
2 ( A + B + C ) = 442
A + B + C = 221 (4)
(4) -( 1)
C = 61
(4) - ( 2)
A = 79
(4) - (3)
B = 81
2006-10-30 06:38:43 · answer #1 · answered by J 7 · 0⤊ 0⤋
a是79
b是81
c是61
請問要不要過程
2006-10-30 06:46:44 · answer #2 · answered by ? 2 · 0⤊ 0⤋
設A,B,C有x,y,z元.
x + y = 160 ------( 1 )
y + z = 142 -----( 2 )
x + z = 140-----( 3 )
( 3 ) + ( 2 ) - ( 1 )
x +z + y + z - x - y = 140 +142 -160
2 z = 122
z = 61
C有61元
2006-10-30 06:43:17 · answer #3 · answered by ? 4 · 0⤊ 0⤋
A+B=160 (1)
B+C=142 (2)
A+C=140 (3)
(1)+(2)+(3): 2A+2B+2C= 442
A+B+C=221 (4)
(4)-(1): C= 61
2006-10-30 06:41:21 · answer #4 · answered by Wailun 2 · 0⤊ 0⤋