问题
解答题
脱式计算,能简便的要用简便方法计算 (1)5120÷32+140 (2)(
(3)[1-(
(4)168.1÷(4.3×2-0.4) |
答案
(1)5120÷32+140,
=160+140,
=300;
(2)(
-1 3
+1 6
)×30,4 5
=
×30-1 3
×30+1 6
×30,4 5
=10-5+24,
=5+24,
=29;
(3)[1-(
-1 2
)]×1 4
,2 3
=[1-
]×1 4
,2 3
=
×3 4
,2 3
=
;1 2
(4)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.