计算下面各题,怎样简便就怎样算.①1.29+3.7+0.71+6.3 ②19×96+962÷74 ③400-(1300÷65+35) ④
计算下面各题,怎样简便就怎样算.①1.29+3.7+0.71+6.3②19×96+962÷74③400-(1300÷65+35)④23.4-8.54-1.46⑤6.75+...
计算下面各题,怎样简便就怎样算.①1.29+3.7+0.71+6.3 ②19×96+962÷74 ③400-(1300÷65+35) ④23.4-8.54-1.46 ⑤6.75+0.5-4.86 ⑥19×36-36×9 ⑦425÷25+575÷25 ⑧(320+280)÷50×4 ⑨(117+43)×(84÷7)
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①1.29+3.7+0.71+6.3, =(1.29+0.71)+(3.7+6.3), =2+10, =12; ②19×96+962÷74, =19×96+13, =1824+13, =1837; ③400-(1300÷65+35), =400-(20+35), =400-55, =345; ④23.4-8.54-1.46, =23.4-(8.54+1.46), =23.4-10, =13.4; ⑤6.75+0.5-4.86, =7.25-4.86, =2.39; ⑥19×36-36×9, =36×(19-9), =36×10, =360; ⑦425÷25+575÷25, =(425+575)÷25, =1000÷25, =40; ⑧(320+280)÷50×4, =600÷50×4, =12×4, =48; ⑨(117+43)×(84÷7), =160×12, =1920. |
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