31ⅹ34 32x34 37x34怎么简便就怎么算?
3个回答
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解: 31x34=34x(30+1)=34x30+34x1
=1020+34=1054
32ⅹ34=3x3 (30x4+30X2) 8
, = 9 (120+60) 8
, = 9 (180 ) 8
, =(9+1) 8 8
, =1088
37x34=3x3 (30x4+30x7) 4ⅹ7
, = 9 (120+210) 28
, = 9 (330) 28
, =(9+3) (30) 28
, = 12 (30+28)
, =1258
注: 后两式叫:乘两头,凑中间。
=1020+34=1054
32ⅹ34=3x3 (30x4+30X2) 8
, = 9 (120+60) 8
, = 9 (180 ) 8
, =(9+1) 8 8
, =1088
37x34=3x3 (30x4+30x7) 4ⅹ7
, = 9 (120+210) 28
, = 9 (330) 28
, =(9+3) (30) 28
, = 12 (30+28)
, =1258
注: 后两式叫:乘两头,凑中间。
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