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设六(1)班人数= A, 六(2)班人数= B
A+B = 86---------------------------------(Equ 1)
(1/4)A + (2/7)B =23----------------------(Equ 2)
4x(Equ 2) – (Equ 1):
A+(8/7)B – (A + B)= 92 – 86
(1/7) B = 6
B = 42 -------------------------------(Equ 3)
Put (Equ 3) into (Equ 1) :
A + 42 = 86
A = 44
A = 44, B= 42
A+B = 86---------------------------------(Equ 1)
(1/4)A + (2/7)B =23----------------------(Equ 2)
4x(Equ 2) – (Equ 1):
A+(8/7)B – (A + B)= 92 – 86
(1/7) B = 6
B = 42 -------------------------------(Equ 3)
Put (Equ 3) into (Equ 1) :
A + 42 = 86
A = 44
A = 44, B= 42
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你这个方程是正确的,解方程就行。
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