题目内容
| 计算下面各题,能简便方法的用简便方法算. 215+85÷17-12 | 125×24 | 158+64+142+236 |
| 400÷(120-20×4) | 156-78-22 | [720÷(13+27)]×12. |
(1)215+85÷17-12,
=215+5-12,
=208;
(2)125×24,
=125×8×3,
=1000×3,
=3000;
(3)158+64+142+236,
=(158+142)+(64+236),
=300+300,
=600;
(4)400÷(120-20×4),
=400÷(120-80),
=400÷40,
=10;
(5)156-78-22,
=156-(78+22),
=156-100,
=56;
(6)[720÷(13+27)]×12,
=[720÷40]×12,
=18×12,
=216.
=215+5-12,
=208;
(2)125×24,
=125×8×3,
=1000×3,
=3000;
(3)158+64+142+236,
=(158+142)+(64+236),
=300+300,
=600;
(4)400÷(120-20×4),
=400÷(120-80),
=400÷40,
=10;
(5)156-78-22,
=156-(78+22),
=156-100,
=56;
(6)[720÷(13+27)]×12,
=[720÷40]×12,
=18×12,
=216.
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