(1+20%)x+(1+10%)y=1290 x+y=1200
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(1+20%)x+(1+10%)y=1290 x+y=1200
(1+20%)x+(1+10%)y=1290 x+y=1200
(1+20%)x+(1+10%)y=1290 x+y=1200
自己想。
(1+20%)x+(1+10%)y=1290 x+y=1200
(1+20%)x+(1+10%)y=1290 x+y=1200
(1+20%)x+(1+10%)y=1290 x+y=1200
自己想。