脱式计算(用你喜欢的方式计算). 2.5×1.25÷1/32 75×32×1.25 101×93-93 43×6.9+69×5.7.
问题描述:
脱式计算(用你喜欢的方式计算). 2.5×1.25÷
|
75×32×1.25 |
||
101×93-93 | 43×6.9+69×5.7. |
答
(1)2.5×1.25÷
,1 32
=2.5×1.25×32,
=(2.5×4)×(1.25×8),
=10×10,
=100;
(2)75×32×1.25,
=(75×4)×(8×1.25),
=300×10,
=3000;
(3)101×93-93,
=(101-1)×93,
=100×93,
=9300;
(4)43×6.9+69×5.7,
=43×6.9+6.9×57,
=(43+57)×6.9,
=100×6.9,
=690.