问题 解答题

①287×25×4

②35×98

③168×327+168×673

④125×64

⑤125×15×4

⑥(1500-250-25)×2.

答案

①287×25×4,

=287×(25×4),

=287×100,

=28700;

②35×98,

=35×(100-2),

=35×100-35×2,

=3500-70,

=3430;

③168×327+168×673,

=168×(327+673),

=168×1000,

=168000;

④125×64,

=125×(8×8),

=125×8×8,

=1000×8,

=8000;

⑤125×15×4,

=125×4×15,

=500×15,

=7500;

⑥(1500-250-25)×2,

=1500×2-250×2-25×2,

=3000-500-50,

=2500-50,

=2450.

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单项选择题