题目内容
脱式计算,能简算的要简算
| 4.5×102 | 0.85×6.7+3.3×0.85 | 0.25×4.87×4 | 25.8-1.58×0.65. |
①4.5×102,
=4.5×(100+2),
=4.5×100+4.5×2,
=450+9,
=459;
②0.85×6.7+3.3×0.85,
=(6.7+3.3)×0.85,
=10×0.85,
=8.5;
③0.25×4.87×4,
=(0.25×4)×4.87,
=1×4.87,
=4.87;
④25.8-1.58×0.65,
=25.8-1.027,
=24.773.
=4.5×(100+2),
=4.5×100+4.5×2,
=450+9,
=459;
②0.85×6.7+3.3×0.85,
=(6.7+3.3)×0.85,
=10×0.85,
=8.5;
③0.25×4.87×4,
=(0.25×4)×4.87,
=1×4.87,
=4.87;
④25.8-1.58×0.65,
=25.8-1.027,
=24.773.
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