P541. 图略2. 2.(1)20.75 (2)2 5 2 5 3. 0.375 1.2 1/4 6/5 25% 37.5%4. 79 1025. 25次-551.(1)9 6 (2)1/6 5/6 (3)17/ 52. 2/5 3/7 9/5 6/73.492÷500=98.4%4.500÷5000=10%5.57 57 57÷57=100%(答案不惟一)