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孙成这学期前几次教学单元测试的平均分是92分,如果这决单元测试能得100分,那他的教学单元测试平均余就能提高2分,孙成已进行7多少次单元测试?
Sun Cheng This semester several teaching unit test average score is 92 points, if the unit test can get 100 points, then his teaching unit test average can improve 2 points, Sun Cheng has been the number of unit tests 7 ?