小学四年级数学题简便方法(1)25X166X4(2)99X56+56(3)(80-8)X125(4)270*6*5
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(1)25X166X4

=25x4x166

=100x166

=16600

(2)99X56+56

=56x(99+1)

=56x100

=5600

(3)(80-8)X125

=80x125-8x125

=10000-1000

=9000

(4 )270*6*5

=270x30

=8100

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