试题:
简便运算.
(
1
3
+
1
6
+
1
9
1
18

1.875÷2.5-
3
8
×0.4

125×3.2×2.50.9+99×0.9.

答案:

我来补答
(1)(
1
3
+
1
6
+
1
9
)÷
1
18

=(
1
3
+
1
6
+
1
9
)×18,
=
1
3
×18+
1
6
×18+
1
9
×18,
=6+3+2,
=11;

(2)1.875÷2.5-
3
8
×0.4,
=0.75-
3
20

=0.75-0.15,
=0.6;

(3)125×3.2×2.5,
=125×8×0.4×2.5,
=(125×8)×(0.4×2.5),
=1000×1,
=1000;

(4)0.9+99×0.9,
=(1+99)×0.9,
=100×0.9,
=90.
 
 
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