脱式计算.①6.4÷(0.3×2+0
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发布时间:2024-10-06 06:29
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时间:2024-12-14 18:45
①6.4÷(0.3×2+0.2),
=6.4÷(0.6+0.2),
=6.4÷0.8,
=8;
②68.1-77.7÷0.7×0.5,
=68.1-111×0.5,
=68.1-55.5,
=12.6;
③3.5×5.2+0.35×48,
=3.5×5.2+3.5×4.8,
=3.5×(5.2+4.8),
=3.5×10,
=35;
④4.05÷0.81+2.4,
=5+2.4,
=7.4.