8.5*4.9=41.65
8.5x4.9竖式计算方法如下图:
8.5x4.9=41.65
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答案:8.5*4.9=41.65,5*9=45向前进4,横线下面写5,8*9=72,72+4=76,横线下写765,4*5=20,向前进2,765的6下面写0,4*8=32,32+2=34,所以765下面是340,相加是4165,两个小数点,最终答案41.65
竖式难写,8.5x4+8.5x0.9=34+8.5x1-8.5x0.1=34+8.5-0.85=42.5-1+0.15=41.5+0.15=41.65
8.5
× 4.9
7 6 5
3 4 0
4 1.6 5