‘壹’ 用简便方法计算。99x7 77x9 33x18
99×7+77×9+33×18
=99×(7+7+6)
=贺郑运99×20
=1980
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‘贰’ 99x7+21怎么简便计算
=7×(敏咐答99+3)
=7×102
=7×(简蚂100+2)桥慧
=700+14
=714
‘叁’ 简便计算:99×7+77×9+33×18
解绝唯旦并扰:简便计算的方法是,将77化成7x11,把18化山蚂成3x6,再提取99即可:
99x7+77x9+33x18
=99x7+11x7x9+33x3x6
=99x7+99x7+99x6
=99x(7+7+6)
=99x20
=1980
‘肆’ 99x7十llx27简便运算怎么做
99x7十液谈唤闹凯llx27
=99x7十侍世llx3x9
=99x7+99x3
=99x(7+3)
=99x10
=990
‘伍’ 99x7的简便计算
99*7=(100-1)*7=100*7-1*7=700-7=693
‘陆’ 99×7+11×15怎么简便计算
(100-1)×7+(10+1)×15=700-7+150+15=858
‘柒’ 99x7的简便计算