题目内容
| 下面各题怎样简便就怎样算. (1)3.7×99+3.7 | (2)
| ||||
| (3)5.93+0.64+0.07+0.36 | (4)(7.9-3.06÷0.68)×1.5 | ||||
| (5)78÷2.5÷0.4 | (6)105×(
|
(1)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370;
(2)
×7.7+3.3×0.75-75%,
=0.75×7.7+3.3×0.75-0.75,
=0.75×(7.7+3.3-1),
=0.75×10,
=7.5;
(3)5.93+0.64+0.07+0.36,
=(5.93+0.07)+(0.64+0.36),
=6+1,
=7;
(4)(7.9-3.06÷0.68)×1.5,
=(7.9-4.5)×1.5,
=3.4×1.5,
=5.1;
(5)78÷2.5÷0.4,
=78÷(2.5×0.4),
=78÷1,
=78;
(6)105×(
+
),
=105×
+105×
,
=35+21,
=56.
=3.7×(99+1),
=3.7×100,
=370;
(2)
| 3 |
| 4 |
=0.75×7.7+3.3×0.75-0.75,
=0.75×(7.7+3.3-1),
=0.75×10,
=7.5;
(3)5.93+0.64+0.07+0.36,
=(5.93+0.07)+(0.64+0.36),
=6+1,
=7;
(4)(7.9-3.06÷0.68)×1.5,
=(7.9-4.5)×1.5,
=3.4×1.5,
=5.1;
(5)78÷2.5÷0.4,
=78÷(2.5×0.4),
=78÷1,
=78;
(6)105×(
| 1 |
| 3 |
| 1 |
| 5 |
=105×
| 1 |
| 3 |
| 1 |
| 5 |
=35+21,
=56.
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