题目内容
| 选择合理的方法计算 49.98÷4.9+6.56 | 0.68÷[(1.2+0.5)×0.5] |
| 0.25×12.5×3.2 | 3.8×7.3-3.8×5.3 |
①49.98÷4.9+6.56
=10.2+6.56
=16.76;
②0.68÷[(1.2+0.5)×0.5]
=0.68÷[1.7×0.5]
=0.68÷0.85
=0.8;
③0.25×12.5×3.2
=0.25×12.5×8×0.4
=(0.25×0.4)×(12.5×8)
=0.1×100
=10;
④3.8×7.3-3.8×5.3
=3.8×(7.3-5.3)
=3.8×2
=7.6.
=10.2+6.56
=16.76;
②0.68÷[(1.2+0.5)×0.5]
=0.68÷[1.7×0.5]
=0.68÷0.85
=0.8;
③0.25×12.5×3.2
=0.25×12.5×8×0.4
=(0.25×0.4)×(12.5×8)
=0.1×100
=10;
④3.8×7.3-3.8×5.3
=3.8×(7.3-5.3)
=3.8×2
=7.6.
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