①3.09×3.9÷2.6
=12.051÷2.6
=4.635
②3.072÷6.4+49.7
=0.48+49.7
=50.18
③69.6÷3.2÷2.5
=69.6÷（3.2×2.5）
=69.6÷（8×0.4×2.5）
=69.6÷（8×1）
=69.6÷8
=8.7
④3.6×2.5+7.5×3.6
=3.6×（2.5+7.5）
=3.6×10
=36
⑤0.125×3.2×0.5
=（0.125×8）×（0.4×0.5）
=1×0.2
=0.2
⑥60.8-36÷7.5
=60.8-4.8
=56
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