0.7×13/11-6.6×3/7-2.2×3/7+0.7×9/11+3.3×8/7=请详细,

0.7×13/11-6.6×3/7-2.2×3/7+0.7×9/11+3.3×8/7=(0.7×13/11+0.7×9/11)-6.6×3/7-2.2×3/7+(1.1×3)×(8×1/7)=(0.7×13/11+0.7×9/11)-6.6×3/7-2.2×3/7+8.8×3/7=0.7×(13/11+9/11)+(8.8-6.6-2.2)×3/7=0.7×...赞同，+8.8×3/7的8.8是怎么来的，请再细，谢谢！