题目内容
脱式计算,能简算的要简算.
| 100-28+72 | 200-28×5 | 297-28-72 | 4×89×25 |
| 54+783÷27 | 40×(62-37) | 78+99+22 | 900÷25÷4. |
(1)100-28+72,
=72+72,
=144;
(2)200-28×5,
=200-140,
=60;
(3)297-28-72,
=297-(28+72),
=297-100,
=197;
(4)4×89×25,
=4×25×89,
=100×89,
=8900;
(5)54+783÷27,
=54+29,
=83;
(6)40×(62-37),
=40×25,
=1000;
(7)78+99+22,
=78+22+99,
=100+99,
=199;
(8)900÷25÷4,
=900÷(25×4),
=900÷100,
=9.
=72+72,
=144;
(2)200-28×5,
=200-140,
=60;
(3)297-28-72,
=297-(28+72),
=297-100,
=197;
(4)4×89×25,
=4×25×89,
=100×89,
=8900;
(5)54+783÷27,
=54+29,
=83;
(6)40×(62-37),
=40×25,
=1000;
(7)78+99+22,
=78+22+99,
=100+99,
=199;
(8)900÷25÷4,
=900÷(25×4),
=900÷100,
=9.
练习册系列答案
相关题目