题目内容

下面各题,怎样算简便就怎样算.
①0.0618×160+6.18×8.4
8
9
×[
3
4
÷(
7
16
-
1
4
)]
4
7
×6+
4
7
+4×
1
10
+
9
10
×4
④2.5×1.6(用三种不同算法简算)
(1)0.0618×160+6.18×8.4,
=6.18×1.6+6.18×8.4,
=(1.6+8.4)×6.18,
=10×6.18,
=61.8;

(2)
8
9
×[
3
4
÷(
7
16
-
1
4
)],
=
8
9
×[
3
4
÷
3
16
]
=
8
9
×4,
=3
5
9


(3)
4
7
×6+
4
7
+4×
1
10
+
9
10
×4,
=
4
7
×(6+1)+(
1
10
+
9
10
)×4,
=4+4,
=8;

(4)2.5×1.6,
=2.5×(4×0.4),
=2.5×4×0.4,
=10×0.4,
=4;
2.5×1.6,
=2.5×(1+0.6),
=2.5×1+2.5×0.6,
=2.5+1.5,
=4;
2.5×1.6,
=2.5×(2×0.8),
=5×0.8,
=4.
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