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8. 800×1/4= 200 800×3/5=480
800-200-480=120. A.
9. 500.000×1/2=250.000
500.000-250.000=250.000
250.000×3/10=75000
500.000-250.000-75.000=175.000. D.
10. 1/3 - 1/5= 5/15 -3/15 = 2/15. C.