题目内容
下面各题,能简便算的要简便
| (100+8)×0.125 | 4.8×102 |
| 5.8×8.5+5.8×0.5+5.8 | (1.5+4.6)×(4.6-1.5) |
(1)(100+8)×0.125
=100×0.125+8×0.125,
=12.5+1,
=13.5;
(2)4.8×102
=4.8×(100+2),
=4.8×100+4.8×2,
=480+9.2,
=489.2;
(3)5.8×8.5+5.8×0.5+5.8
=5.8×8.5+5.8×0.5+5.8×1,
=5.8×(8.5+0.5+1),
=5.8×10,
=58;
(4)(1.5+4.6)×(4.6-1.5)
=6.1×3.1,
=18.91.
=100×0.125+8×0.125,
=12.5+1,
=13.5;
(2)4.8×102
=4.8×(100+2),
=4.8×100+4.8×2,
=480+9.2,
=489.2;
(3)5.8×8.5+5.8×0.5+5.8
=5.8×8.5+5.8×0.5+5.8×1,
=5.8×(8.5+0.5+1),
=5.8×10,
=58;
(4)(1.5+4.6)×(4.6-1.5)
=6.1×3.1,
=18.91.
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