方┡ 21=1000A +100B程┡组┡46.5=72500A+150B:A= B=

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方┡21=1000A+100B程┡组┡46.5=72500A+150B:A=B=方┡21=1000A+100B程┡组┡46.5=72500A+150B:A=B=方┡21=1000A+100B程┡组┡4

方┡ 21=1000A +100B程┡组┡46.5=72500A+150B:A= B=
方┡ 21=1000A +100B
程┡
组┡46.5=72500A+150B
:A=
B=

方┡ 21=1000A +100B程┡组┡46.5=72500A+150B:A= B=
"21=1000A +100B"两边同时乘以3 ①式子为63=3000A+300B
“46.5=72500A+150B”两边同时乘以2 ②式子为93=145000A+300B
再拿②-①,得:142000A=30 A=14200分之3
把B代入① B=1775分之369