问:用乘法运算定律计算下面各题.752×1.25＋4.45×12.5+0.035×问:用乘法运算定律计算下面各题.752×1.25_数学解答

问:用乘法运算定律计算下面各题.752×1.25＋4.45×12.5+0.035×
问:用乘法运算定律计算下面各题.
752×1.25＋4.45×12.5+0.035×125
0.42×160+36×1.6-31×3.2
1.625+2.625+3.625+...+79.625+80.625

人气：246 ℃　时间：2020-02-06 04:29:22

解答

752×1.25＋4.45×12.5+0.035×125=752*1.25+44.5*1.25+3.5*1.25=(752+44.5+3.5)*1.25=800*1.25=10000.42×160+36×1.6-31×3.2=42*1.6+36*1.6-63*1.6=(42+36-63)*1.6=15*1.6=241.625+2.625+3.625+...+79.625+80.625...