递等式计算:
(160﹣48÷12)×4
336÷[(36﹣29)×6]
62×(300﹣145÷5)
解:①(160﹣48÷12)×4,
=(160﹣4)×4,
=156×4,
=624;
②336÷(36﹣29)×6,
=336÷7×6,
=336÷42,
=8;
③62×(300﹣145÷5),
=62×(300﹣29),
=62×271,
=16802.
由2﹣氯丙烷制得少量的需要经过下列几步反应( )
—I have trouble learning math this term.
—You should pay more _______ to your teacher's advice.
____(.)
自秦朝建立以来,君权与相权的矛盾、中央与地方的矛盾一直是古代政治体制演进过程中的重要问题,其实质是( )