如题所述
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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第1个回答 2020-03-08
原式
=(31+32+37)×34
=100×34
=3400
=(31+32+37)×34
=100×34
=3400
第2个回答 2020-03-08
31*34+32*34+37*34
=34*(31+32+37)
=34*100
=3400
=34*(31+32+37)
=34*100
=3400