问题
解答题
用简便方法计算 (1)32×0.25×1.25 (2)8×
|
答案
(1)32×0.25×1.25,
=(4×8)×0.25×1.25,
=(4×0.25)×(8×1.25),
=1×10,
=10;
(2)8×
-3÷3 4
-4 3
,3 4
=8×
-3×3 4
-3 4
,3 4
=(8-3-1)×
,3 4
=4×
,3 4
=3.
用简便方法计算 (1)32×0.25×1.25 (2)8×
|
(1)32×0.25×1.25,
=(4×8)×0.25×1.25,
=(4×0.25)×(8×1.25),
=1×10,
=10;
(2)8×
-3÷3 4
-4 3
,3 4
=8×
-3×3 4
-3 4
,3 4
=(8-3-1)×
,3 4
=4×
,3 4
=3.