计算下面各题,能简便的就简便计算。 20
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3.09×3.9÷2.6
=3.09×(3.9÷2.6)
=3.09×1.5
=4.635
3.072÷6.4+49.7
=0.48+49.7
=50.17
69.6÷3.2÷2.5
=69.6÷(3.2×2.5)
=69.6÷8
=8.7
60.8-36÷7.5
=60.8-4.8
=56
=3.09×(3.9÷2.6)
=3.09×1.5
=4.635
3.072÷6.4+49.7
=0.48+49.7
=50.17
69.6÷3.2÷2.5
=69.6÷(3.2×2.5)
=69.6÷8
=8.7
60.8-36÷7.5
=60.8-4.8
=56
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