6: 0.8×0.8×1.25=80
7: 0.68×25×40
=0.68×(25×40)
=0.68×1000
=680
8: ⑴ 250克=0.25千克 200克=0.2千克
6.8÷0.25=27.2
8.5÷0.2=42.5
⑵ (27.2+42.5)×2
=69.7×2
=139.4
9: ⑴ (35.2+4.8)×9.5
=40×9.5
=380
⑵ (35.2-4.8)×9.5
=30.4×9.5
=288.8
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