问题
解答题
用递等式计算下面各题: (1)(0.125×8-0.5)×4 (2)
(3)
|
答案
(1)(0.125×8-0.5)×4,
=(1-0.5)×4,
=0.5×4,
=2;
(2)
÷6+9 20
×1 6 1 20
=
×9 20
+1 6
×1 6
,1 20
=(
+9 20
)×1 20
,1 6
=
×1 2
,1 6
=
;1 12
(3)
×0.25+5 6
×1 4 1 6
=
×5 6
+1 4
×1 4
,1 6
=(
+5 6
)×1 6
,1 4
=1×
,1 4
=
;1 4
(4)4-[3.75×(1.2-
)+1 3
]3 4
=4-[3.75×(
-6 5
)+1 3
],3 4
=4-[3.75×
-3.75×6 5
+0.75],1 3
=4-[4.5-1.25+0.75],
=4-4,
=0.