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.
=(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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