计算下面各题,怎样简便就怎样算
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①51+0.27-(8+0.53)-(2-0.53)
=51+0.27-8-0.53-2+0.53
=51-8-2+0.27-0.53+0.53
=41+0.27
=41.27
②(200-33)+(200+32)+(500-32)
=200-33+200+32+500-32
=200+200+500-33+32-32
=900-33
=867
③(300+10)-(100+25)-(100-25)
=300+10-100-25-100+25
=300-100-100+10-25+25
=110
④13×(25×4)×2
=13×100×2
=2600
⑤1000÷(125×8)
=1000÷1000
=1
④⑤两题简算用到的是
4×25=100
8×125=1000
两个简算,这个以后都要背的
=51+0.27-8-0.53-2+0.53
=51-8-2+0.27-0.53+0.53
=41+0.27
=41.27
②(200-33)+(200+32)+(500-32)
=200-33+200+32+500-32
=200+200+500-33+32-32
=900-33
=867
③(300+10)-(100+25)-(100-25)
=300+10-100-25-100+25
=300-100-100+10-25+25
=110
④13×(25×4)×2
=13×100×2
=2600
⑤1000÷(125×8)
=1000÷1000
=1
④⑤两题简算用到的是
4×25=100
8×125=1000
两个简算,这个以后都要背的
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