(39+530*400):100

(54000+840*300):10

5264:7*30

4384:8*50

1.(39+530*400)÷100    (39+212000)÷100    212039÷100≈2120.392.(54000+840*300)÷10   (54000+252000)÷10   306000÷10=306003.5264÷7*30   157920÷7=225604.4384÷8*50    219200÷8=27400