计算下面各题,能简便计算的要用简便方法计算. (40-4)×25 56×125 98+98×99 101×43 206
计算下面各题,能简便计算的要用简便方法计算.(40-4)×2556×12598+98×99101×43206×(39÷13×4)420÷[(205-198)×4]....
计算下面各题,能简便计算的要用简便方法计算. (40-4)×25 56×125 98+98×99 101×43 206×(39÷13×4) 420÷[(205-198)×4].
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(1)(40-4)×25, =40×25-4×25, =1000-100, =900; (2)56×125, =7×8×125, =7×(8×125), =7×1000, =7000; (3)98+98×99, =(1+99)×98, =100×98, =9800; (4)101×43, =(100+1)×43, =100×43+1×43, =4300+43, =4343; (5)206×(39÷13×4), =206×(3×4), =206×12, =(200+6)×12, =200×12+6×12, =2400+72, =2472; (6)420÷[(205-198)×4], =420÷[7×4], =420÷7÷4, =60÷4, =15. |
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