二年級數(shù)學口算題:9乘法口訣練習題

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    按規(guī)律填一填。
    9×1=9 ······( )個9相加,比10少1;
    9×2=18 ······( )個9相加,比20少2;
    9×3=( )······( )個9相加,比( )少( );
    9×4=( )······( )個9相加,比( )少( );
    9×5=( )······( )個9相加,比( )少( );
    9×6=( )······( )個9相加,比( )少( );
    9×7=( )······( )個9相加,比( )少( );
    9×8=( )······( )個9相加,比( )少( );
    9×9=( )······( )個9相加,比( )少( )。