问题
解答题
脱式计算,能简算的要简算. (1)(
(2)[1-(
(3)6.46-(5.37-3.54) (4)5.58-
|
答案
(1)(
+5 6
+7 12
)÷3 8
,1 48
=(
+5 6
+7 12
)×48,3 8
=
×48+5 6
×48+7 12
×48,3 8
=40+28+18,
=86;
(2)[1-(
+1 2
)×1 3
]÷1 5
,5 6
=[1-(
+3 6
)×2 6
]×1 5
,6 5
=[1-
×5 6
]×1 5
,6 5
=[1-
]×1 6
,6 5
=
×5 6
,6 5
=1;
(3)6.46-(5.37-3.54),
=6.46-5.37+3.54,
=(6.46+3.54)-5.37,
=10-5.37,
=4.63;
(4)5.58-
+5.42-3 5
,2 5
=(5.58+5.42)-(
+3 5
),2 5
=11-1,
=10.