用简便方法计算下面各题.(1)9.14-1.43-4.57(2)29×33-33×9(
用简便方法计算下面各题.(1)9.14-1.43-4.57(2)29×33-33×9(3)3200÷4÷25(4)634+78+66+122....
用简便方法计算下面各题.(1)9.14-1.43-4.57(2)29×33-33×9(3)3200÷4÷25(4)634+78+66+122.
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(1)9.14-1.43-4.57,
=9.14-(1.43+4.57),
=9.14-6,
=3.14;
(2)29×33-33×9,
=(29-9)×33,
=20×33,
=660;
(3)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(4)634+78+66+122,
=(634+66)+(78+122),
=700+200,
=900.
=9.14-(1.43+4.57),
=9.14-6,
=3.14;
(2)29×33-33×9,
=(29-9)×33,
=20×33,
=660;
(3)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(4)634+78+66+122,
=(634+66)+(78+122),
=700+200,
=900.
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