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下面各题怎样计算简便就怎样算. 158+36+42+264 19×27+190×5+19×23 957-(158+457

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下面各题怎样计算简便就怎样算.
158+36+42+264 19×27+190×5+19×23 957-(158+457)
301×99 600÷12÷5 (125×99+125)×16.
下面各题怎样计算简便就怎样算. 158+36+42+264 19×27+190×5+19×23 957-(158+457
①158+36+42+264,
=(158+42)+(36+264),
=200+200,
=400;
②19×27+190×5+19×23,
=19×(27+50+23),
=19×100,
=1900;
③957-(158+457),
=957-457-158,
=500-158,
=342;
④301×99,
=301×(100-1),
=301×100-301,
=30100-300-1,
=29799;
⑤600÷12÷5,
=600÷(12×5),
=600÷60,
=10;
⑥(125×99+125)×16
=125×(99+1)×16,
=12500×8×2,
=100000×2,
=200000.