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All-round learning practice test answer 7 mathematics
1 ~ 6 ADCDAC 7.24 8. 150 9.45 10.45 10.45、90 1 1.50 12.45 13。

Solution: Let this angle be x degrees.

X+90-X+ 180-X = 90 × (two and a third)

X = 60, then its complementary angle is:180-60 =120.