小學(xué)二年級(jí)整十?dāng)?shù)減兩位數(shù)的減法口算題

（1）80 + 51 =
    （2）60 + 21 =
    （3）60 + 36 =
    （4）60 + 21 =
    （5）90 + 71 =
    （6）50 + 49 =
    （7）60 + 50 =
    （8）80 + 61 =
    （9）80 + 34 =
    （10）80 + 75 =
    （11）50 + 19 =
    （12）50 + 27 =
    （13）20 + 11 =
    （14）60 + 14 =
    （15）80 + 22 =