问题
解答题
用简便方法计算. (1)(
(2)
|
答案
(1)(
-1 8
+1 6
)×24,1 4
=
×24-1 8
×24+1 6
×24,1 4
=3-4+6,
=3+6-4,
=5;
(2)
+3.9+0.7+3 10
,1 10
=0.3+3.9+0.7+0.1,
=(0.3+0.7)+(3.9+0.1),
=1+4,
=5.
用简便方法计算. (1)(
(2)
|
(1)(
-1 8
+1 6
)×24,1 4
=
×24-1 8
×24+1 6
×24,1 4
=3-4+6,
=3+6-4,
=5;
(2)
+3.9+0.7+3 10
,1 10
=0.3+3.9+0.7+0.1,
=(0.3+0.7)+(3.9+0.1),
=1+4,
=5.