31×2+30×2×26=用简便计算

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31×2+30×2×26=用简便计算
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31×2+30×2×26=用简便计算
31×2+30×2×26=用简便计算

31×2+30×2×26=用简便计算
30x2+2+30x2x26
=30x2x(1+26)+2
=60x27+2
=1620+2
=1622

62+60*26=1622

=62+60X26
=60+60X26+2
=60X(1+26)+2
=60X27+2
=1620+2
=1622