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a=7
L=1/2*7-1=3 1/2=1=2 1/2=p
3a+1½=2¼
a=1/4
L=3*1/4+1 1/2=3/4+1 2/4=1 5/4=2 1/4=P
½a-1=2½
½ * a=2½+1
½a=3½
a=3½:½
a=7/2*2/1
a=7
spr:
½*7-1=2½
3½-1=2½
2½=2½
2.
3a+1½=2¼
3*a=2¼-1½
3a=9/4-3/2
3a=9/4-6/4
3a=¾
a=¾ :3
a=¾*⅓
a=¼
spr:
3*¼+1½=2¼
¾+1½=2¼
¾+³/₂=2¼
¾+⁶/₄=2¼
⁹/₄=2¼
2¼=2¼