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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: giải giúp mình mấy bài này 24a+56b+56c=0.51 64a+64b+56c=0.69 40a+160.0.5b=0.45

Toán Lớp 9: giải giúp mình mấy bài này
24a+56b+56c=0.51
64a+64b+56c=0.69
40a+160.0.5b=0.45

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222-9+11+12:2*14+14 = ? ( )