五下异分母分数加法和减法

小学徐祥苏教版五年级数学下册 15+ 35 56 13- 815+ 415- 12 14 同分母分数加、减法异分母分数加、减法 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法+ 12 14 =24+ 14 =34 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法+= 12 14 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法+14 24 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法+= 14 34 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法 24 + 12 14 =24+ 14 =34+ 12 14 = 0.5+0.25 =0.75 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法 34+ 16= 9 12+ 2 12= 11 12 计算异分母分数加法,通常先通计算异分母分数加法,通常先通分,把异分母分数化成同分母分数, 分,把异分母分数化成同分母分数, 再相加。再相加。 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法 56 13- = 26 56-= 36= 12计算异分母分数减法,通常先通计算异分母分数减法,通常先通分化成同分母分数后再减。计算结果分化成同分母分数后再减。计算结果能约分的要约成最简分数。能约分的要约成最简分数。试一试试一试 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法试一试试一试 1 49= 99- - 49= 59验算: 49 59+ = 99=1 Yifenmu fenshu jiafa he jianfa 异分母分数加法和减法