计算下面各题,怎样简便就怎样算.385×99 &...
计算下面各题,怎样简便就怎样算.385×996.3+0.84+3.7+8.16312×4+188×42000-178-32285÷(75-70)×4125×72....
计算下面各题,怎样简便就怎样算.385×99 6.3+0.84+3.7+8.16 312×4+188×4 2000-178-322 85÷(75-70)×4 125×72.
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(1)385×99
=385×(100-1)
=38500-385
=38115;
(2)6.3+0.84+3.7+8.16
=(6.3+3.7)+(0.84+8.16)
=10+9
=19;
(3)312×4+188×4
=(312+188)×4
=500×4
=2000;
(4)2000-178-322
=2000-(178+322)
=2000-500
=1500;
(5)85÷(75-70)×4
=85÷5×4
=17×4
=68;
(6)125×72
=125×(80-8)
=125×80-125×8
=10000-1000
=9000.
=385×(100-1)
=38500-385
=38115;
(2)6.3+0.84+3.7+8.16
=(6.3+3.7)+(0.84+8.16)
=10+9
=19;
(3)312×4+188×4
=(312+188)×4
=500×4
=2000;
(4)2000-178-322
=2000-(178+322)
=2000-500
=1500;
(5)85÷(75-70)×4
=85÷5×4
=17×4
=68;
(6)125×72
=125×(80-8)
=125×80-125×8
=10000-1000
=9000.
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