1.76乘2点2目录
2.34乘以0.68乘一点二用简便计算
2.34x0.68x1.2
=(2.34x0.7-2.34x0.02)x1.2
=(1.638-0.0468)x1.2
=1.5912x1.2
=1.90944
6/7*2.6 12/7*2.2=6/7*2.6 2*6/7*2.2=6/7*（2.6 2.2*2）=6
也就是说把后面的七分之十二，写成二乘六除以七。
二点二乘二，得到七
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2.34乘以0.68乘一点二用简便计算
2.34x0.68x1.2
=(2.34x0.7-2.34x0.02)x1.2
=(1.638-0.0468)x1.2
=1.5912x1.2
=1.90944