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如图, , 将求的过程填写完整.

解:(            ▲            )

            ▲            .(            ▲            )

, (            ▲            )

(            ▲            )

            ▲            .(            ▲            )

            ▲            (            ▲            )

(            ▲            )

            ▲            .(            ▲            )

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