7乘31加28乘31,怎样简便计算?
7乘31加28乘31,怎样简便计算?
31*(7+28)
=1085
72乘31加25乘31加3乘21 怎样简便计算
72*31+25*31*3*31
=(72+25+3)*31
=100*31
=3100
35乘7加31乘14简便计算
35乘7加31乘14简便计算
35*7+31*14
=(35+31*2)*7
=97*7
=679
31乘7乘125简便计算
31*(7*125)=31*875=30*875+1*875= 26250+875=27125
67加67乘31加67乘69加67乘99怎样简便计算
67加67乘31加67乘69加67乘99怎样简便计算
67+67x31+67x69+67x99
=67x(1+31+69+99)
=67x200
=13400
简便计算38乘8加31乘16
38x8+31x16
=38x8+31x2x8
=8x(38+62)
=8x100
=800
196乘31_96乘31简便计算
196乘31_96乘31简便计算
=31×(196-96)
=31×100
=3100
29乘18加31乘18简便计算
29乘18加31乘18简便计算
29x18+31x18
=(29+31)x18
=60x18
=1080
19乘50加2乘31乘25简便计算
19x50+2x31x25
=25x(38+62)
=25x100
=2500
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6.9乘2.5加31乘2.5的简便计算
6.9x2.5+3.1x2.5
=(6.9+3.1)x2.5
=10x2.5
=25