两位数加减一位数口算过程.pdf
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1、两位数加减一位数口算过程两位数加减一位数口算过程两位数加一位数(不进位)口算过程两位数加一位数(不进位)口算过程48 +40 =3 +26 =48 +40 =3 +26 =先算:先算:再算:再算:50 +43 =8 +34 =50 +43 =8 +34 =先算:先算:再算:再算:85 +10 =2 +77 =85 +10 =2 +77 =先算:先算:再算:再算:先算:先算:再算:再算:先算:先算:先算:先算:再算:再算:再算:再算:78 +20 =4 +44 =78 +20 =4 +44 =先算:先算:再算:再算:67 +2 =58 +3 =67 +2 =58 +3 =先算:先算:再算:再算:
2、两位数加一位数(进位)口算过程两位数加一位数(进位)口算过程方法一:方法一:先算:先算:再算:再算:先算:先算:再算:再算:方法二:方法二:32 +9 =32 +9 =32 +9 =32 +9 =先算:先算:再算:再算:方法一:方法一:48 +7 =48 +7 =48 +7 =48 +7 =先算:先算:再算:再算:方法一:方法一:8 +63 =8 +63 =8 +63 =8 +63 =先算:先算:再算:再算:方法二:方法二:先算:先算:再算:再算:方法二:方法二:先算:先算:先算:先算:再算:再算:再算:再算:两位数加一位数(进位)口算过程两位数加一位数(进位)口算过程方法一:方法一:79 +
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