stone-911
幼苗
共回答了15个问题采纳率:86.7% 举报
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
1年前
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