0.64×25×7.8+2.2
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/14 11:46:19
0.64×25×7.8+2.20.64×25×7.8+2.20.64×25×7.8+2.2127127，没计算器用手机算了简便算法0.64×25×7.8+2.2=16*（7.8+2.2）-16*2.2
0.64×25×7.8+2.2
0.64×25×7.8+2.2
0.64×25×7.8+2.2
127
127，没计算器用手机算了
简便算法
0.64×25×7.8+2.2
=16*（7.8+2.2）-16*2.2+2.2
=16*10-（16-1）*2.2
=160-15*2.2
=160-33
=-127
0.64*25*7.8+2.2 =4×0.16×25×7.8+2.2 =（4×25）×0.16=0.16*(4*25)*7.8+2.22=0.16*100*7.8+2.2=16脳7.8+2.2=
0.64×25×7.8+2.2
=0.16×﹙4×25﹚×7.8＋2.2
=0.16×100×7.8＋2.2
=16×7.8+2.2
=127
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