用简便方法计算下面各题．5×7×16×2×12558×56-56+56×4378÷911+18÷91129×15+29×45+29

Question

用简便方法计算下面各题．5×7×16×2×12558×56-56+56×4378÷911+18÷91129×15+29×45+29．

Answer 1

（1）5×7×16×2×125
=5×2×7×2×8×125
=（5×2）×（7×2）×（8×125）
=10×14×1000
=140000

（2）58×56-56+56×43
=56×（58-1+43）
=56×100
=5600

（3）78÷911+18÷911
=78×

1

911

+18×

1

911

=（78+18）×

1

911

=96×

1

911

=

96

911

（4）29×15+29×45+29
=29×（15+45）+29
=29×60+29
=1740+29
=1769．