题目内容

简便计算.
5
8
+
1
3
+
3
8
+
2
3
+8
4×0.8×2.5×1.25 117×12+83×12.
(1)
5
8
+
1
3
+
3
8
+
2
3
+
8,
=(
5
8
+
3
8
)+(
1
3
+
2
3
)+8,
=1+1+8,
=10;

(2)4×0.8×2.5×1.25,
=(4×2.5)×(0.8×1.25),
=10×1,
=10;

(3)117×12+83×12,
=(117+83)×12,
=200×12,
=2400.
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