问题
解答题
用简便方法计算,并要写出主要的简算过程. ①
②12.5×8×4×0.25. |
答案
①
+7 11
+1 5
+4 11 3 5
=(
+7 11
)+(4 11
+1 5
)3 5
=1+4 5
=1
;4 5
②12.5×8×4×0.25
=(12.5×8)×(4×0.25)
=100×1
=100.
用简便方法计算,并要写出主要的简算过程. ①
②12.5×8×4×0.25. |
①
+7 11
+1 5
+4 11 3 5
=(
+7 11
)+(4 11
+1 5
)3 5
=1+4 5
=1
;4 5
②12.5×8×4×0.25
=(12.5×8)×(4×0.25)
=100×1
=100.