问题
解答题
用你喜欢的方法脱式计算. (1)128+750÷25×18 (2)(800×
(3)
(4)[1-(
|
答案
(1)128+750÷25×18
=128+30×18,
=128+540,
=668;
(2)(800×
-360)÷40 4 5
=(640-360)÷40,
=280÷40,
=7;
(3)
×13 8
+3 7
×3 8 3 7
=(
+13 8
)×3 8
,3 7
=2×
,3 7
=
;6 7
(4)[1-(
-1 2
)]×1 4 2 3
=[1-
]×1 4
,2 3
=
×3 4
,2 3
=
.1 2