下面各题怎样简便就怎样算.472+66+134 324+75+46+25+54 283+36+64+17 15+57+185 125+75+26+74
下面各题怎样简便就怎样算.472+66+134324+75+46+25+54283+36+64+1715+57+185125+75+26+7498+(24+102)...
下面各题怎样简便就怎样算.472+66+134 324+75+46+25+54 283+36+64+17 15+57+185 125+75+26+74 98+(24+102)
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(1)472+66+134, =472+(66+134), =472+200, =672; (2)324+75+46+25+54, =324+(75+25)+(54+46), =324+100+100, =524; (3)283+36+64+17, =(283+17)+(36+64), =300+100, =400; (4)15+57+185, =(15+185)+57, =200+57, =257; (5)125+75+26+74, =(125+75)+(26+74), =200+100, =300; (6)98+(24+102), =98+24+102, =(98+102)+24, =200+24, =224. |
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