(1)8.27+5.84+1.73+2.16, =(8.27+1.73)+(5.84+2.16), =10+8, =18. (2)18.51-9.08-0.92, =18.51-(9.08+0.92), =18.51-10, =8.51. (3)528÷6×5-432, =88×5-432, =440-432, =8. (4)282×5+18×5, =(282+18)×5, =300×5, =1500. (5)75+360÷20+15, =75+18+15, =(75+15)+18, =90+18, =108. (6)(641-341)÷25×4, =300÷25×4, =12×4, =48. |