| 285+195+105+415 643-48-12-40 25×32 8×48×125 5400÷45÷2 360÷45 148×8+152×8 99×34 25×201-25. |
| (1)285+195+105+415, =(285+415)+(195+105), =700+300, =1000; (2)643-48-12-40, =643-(48+12+40), =643-100, =543; (3)25×32, =(25×4)×8, =100×8, =800; (4)8×48×125, =(8×125)×48, =1000×48, =48000; (5)5400÷45÷2, =5400÷(45×2), =5400÷90, =60; (6)360÷45, =360÷9÷5, =40÷5, =8; (7)148×8+152×8, =(148+152)×8, =300×8, =2400; (8)99×34, =34×100-34×1, =3400-34, =3366; (9)25×201-25, =25×(201-1), =25×200, =5000. |
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