神马作文网问:用乘法运算定律计算下面各题.752×1.25＋4.45×12.5+0.035×
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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
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
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
=1000
0.42×160+36×1.6-31×3.2
=42*1.6+36*1.6-63*1.6
=(42+36-63)*1.6
=15*1.6
=24
1.625+2.625+3.625+...+79.625+80.625
=(1+2+...+80)+80*0.625
=3240+50
=3290
=752*1.25+44.5*1.25+3.5*1.25
=(752+44.5+3.5)*1.25
=800*1.25
=1000
0.42×160+36×1.6-31×3.2
=42*1.6+36*1.6-63*1.6
=(42+36-63)*1.6
=15*1.6
=24
1.625+2.625+3.625+...+79.625+80.625
=(1+2+...+80)+80*0.625
=3240+50
=3290