(1)已知:△+△+△=15,△+□=23;N7U.q2u/V7U2y,m0q*Q+I5p-|:t
求:△=9C2X6U2S(u/M+N,□=;_7s1b8t)T+E0v1r7~,^({;N7U.q2u/V7U2y,m0q*Q+I5p-|:t
(2)已知: □×△=36,△÷○=3,□=4;N7U.q2u/V7U2y,m0q*Q+I5p-|:t
求:△=2\6x'[6b*Q,○=9]/T2Q6d1C1D,N;N7U.q2u/V7U2y,m0q*Q+I5p-|:t
(3)已知: ○+○=12,△+○=14,□+△+△=20;N7U.q2u/V7U2y,m0q*Q+I5p-|:t
求:○=;V;I9F,△=(]/F4~;`6S,I;t+|:j4d,□=3Y8t7\7]/q3r;N7U.q2u/V7U2y,m0q*Q+I5p-|:t