问题
解答题
采用灵活、简捷的方法计算
|
答案
(1)95.6×19-95.6×9,
=95.6×(19-9),
=95.6×10,
=956;
(2)(30+
)÷15,5 14
=(30+
)×5 14
,1 15
=30×
+1 15
×5 14
,1 15
=2+
,1 42
=2
;1 42
(3)4-1÷3-
×8,1 3
=4-
-1 3
,8 3
=4-(
+1 3
),8 3
=4-3,
=1;
(4)18
÷9,9 20
=18
×9 20
,1 9
=(18+
)×9 20
,1 9
=18×
+1 9
×9 20
,1 9
=2+
,1 20
=2
;1 20
(5)
×7.5+(1+1 5
)×3,1 5
=
×7.5+1 5
×3,6 5
=1.5+3.6,
=5.1;
(6)3.2×12.5,
=0.4×8×12.5,
=0.4×(8×12.5),
=0.4×100,
=40.