题目内容
| 简算: 1.2×2.5 | 3.14×78+31.4×2.2. |
(1)1.2×2.5,
=0.3×(4×2.5),
=0.3×10,
=3;
(2)3.14×78+31.4×2.2,
=3.14×78+3.14×22,
=3.14×(78+22),
=3.14×100,
=314.
=0.3×(4×2.5),
=0.3×10,
=3;
(2)3.14×78+31.4×2.2,
=3.14×78+3.14×22,
=3.14×(78+22),
=3.14×100,
=314.
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