如题所述
第1个回答 2022-10-21
38×7 31×14简便计算
简便计算:38×7 31×14
=27778x14
=388892
简便计算38×7+14
38×7+14
=38×7+2×7
=(38+2)×7
=40×7
=280
112*31+56*38简便计算
112*31+56*38
=56×2×31+56×38
=56×(62+38)
=56×100
=5600
38×7+31×14 用简便方法计算
如下:
38×7+31×14
=38x7+31x2x7
=(38+31x2)x7
=100x7
=700
38×68+38×31+99的简便计算
38×68+38×31+99
=38×(68+31)+99
=38×99+99
=(38+1)×99
=39×99
=39×(100-1)
=39×100-39×1
=3900-39
=3861
38+13+14的简便计算
38+13+14的简便计算
解:直接运算最简便,
原式=51+14
=65
369减38加31减162简便计算
369 - 38 +31 -162
=369+31 -(38+162)
=400-200
=200
简便计算:38-14 62-36
原式
=38-14+62-36
=(38+62)-(14+36)
=100-50
=50
供参考。
[49 (31×56)]÷7简便计算
[49+(31×56)]÷7
=49÷7+31×56÷7
=7+248
=255
42.6*38+85.2*31怎么简便计算
42.6*38+85.2*31
=42.6*38+42.6*62
=42.6×(38+62)
=42.6×100
=4260