计算下面各题,能简便计算的要用简便方法计算.60÷15+15×60 206×(39÷13×4) 125×54-46×125
计算下面各题,能简便计算的要用简便方法计算.60÷15+15×60206×(39÷13×4)125×54-46×125(730-80÷2)÷23400×[(270+80)...
计算下面各题,能简便计算的要用简便方法计算.60÷15+15×60 206×(39÷13×4) 125×54-46×125 (730-80÷2)÷23 400×[(270+80)÷7] 99+99×99.
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(1)60÷15+15×60,
=4+900,
=904;
(2)206×(39÷13×4),
=206×(3×4),
=206×12,
=2472;
(3)125×54-46×125,
=125×(54-46),
=125×8,
=1000;
(4)(730-80÷2)÷23,
=(730-40)÷23,
=690÷23,
=30;
(5)400×[(270+80)÷7],
=400×[350÷7],
=400×50,
=20000;
(6)99+99×99,
=99×(1+99),
=99×100,
=9900.
=4+900,
=904;
(2)206×(39÷13×4),
=206×(3×4),
=206×12,
=2472;
(3)125×54-46×125,
=125×(54-46),
=125×8,
=1000;
(4)(730-80÷2)÷23,
=(730-40)÷23,
=690÷23,
=30;
(5)400×[(270+80)÷7],
=400×[350÷7],
=400×50,
=20000;
(6)99+99×99,
=99×(1+99),
=99×100,
=9900.
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