計(jì)算下面各題,怎樣簡便就怎樣算.
284+28+116
180+74+27+126+120+73
2×l25×8×5
125×897×835×101
33×46+46×17
973×5×2
68×99.
解:(1)284+28+116,
=(284+116)+28,
=400+28,
=428;
(2)180+74+27+126+120+73,
=(180+120)+(74+126)+(27+73),
=300+200+100,
=500+100,
=600;
(3)2×l25×8×5,
=(2×5)×(125×8),
=10×1000,
=10000;
(4)125×897×835×101,
=112125×835×101,
=93624375×101,
=9456061875;
(5)33×46+46×17,
=46×(33+17),
=46×50,
=2300;
(6)973×5×2,
=973×(5×2),
=973×10,
=9730;
(7)68×99,
=68×(100-1),
=68×100-68×1,
=6800-68,
=6732.
分析:根據(jù)四則混合運(yùn)算的順序進(jìn)行解答,靈活運(yùn)用運(yùn)算定律簡算.
點(diǎn)評(píng):本題主要考查了學(xué)生在四則混合運(yùn)算中靈活運(yùn)用簡便算法的計(jì)算能力.