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8/9-8/9×0.1
=8/9×(1-0.1)
=8/9×0.9
=0.8
4/5-0.8×0.1
=4/5×(1-0.1)
=4/5×0.9
=0.72
0.17×5/8×20
=0.17×20×5/8
=3.4×5/8
=17/8