你好：
8.8-0.8×2/7+6/5
=8+0.8×1-0.8×2/7+6/5
=8+0.8×(1-2/7)+6/5
=8+4/5×5/7+1+1/5
=9+4/7+1/5
=9+20/35+7/35
=9+27/35
=9又27/35
(30-24.6÷1.2）×0.36
=30×0.36-246/12×36/100
=30×0.36-2.46×3
=3×3.6-2.46×3
=3×(3.6-2.46)
=3×1.14
=3.42
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