下面各题怎样算简便就怎样算.28.4-6.35-3.65+12.654×99+5415
下面各题怎样算简便就怎样算.28.4-6.35-3.65+12.654×99+5415×4×25×628.52-(5.7+7.52)...
下面各题怎样算简便就怎样算.28.4-6.35-3.65+12.654×99+5415×4×25×628.52-(5.7+7.52)
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(1)28.4-6.35-3.65+12.6, =28.4-(6.35+3.65)+12.6, =28.4-10+12.6, =28.4+12.6-10, =41-10, =31; (2)54×99+54, =54×(99+1), =54×100, =5400; (3)15×4×25×6, =(15×6)×(4×25), =90×100, =9000; (4)28.52-(5.7+7.52), =28.52-5.7-7.52, =28.52-7.52-5.7, =21-5.7, =15.3. |
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