脱式计算,能简算的要简算.0.125+3.7×18+18×5.3 (4.6÷5+0.4×0.2)×2.8910×[59÷(12?16)](212.
脱式计算,能简算的要简算.0.125+3.7×18+18×5.3(4.6÷5+0.4×0.2)×2.8910×[59÷(12?16)](2125+1415)×57+13....
脱式计算,能简算的要简算.0.125+3.7×18+18×5.3 (4.6÷5+0.4×0.2)×2.8910×[59÷(12?16)](2125+1415)×57+13.
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(1)0.125+3.7×
+
×5.3
=0.125+3.7×0.125+0.125×5.3,
=0.125×(1+3.7+5.3),
=0.125×10,
=1.25;
(2)(4.6÷5+0.4×0.2)×2.8
=(0.92+0.08)×2.8,
=1×2.8,
=2.8;
(3)
×[
÷(
-
)]
=
×[
÷
],
=
×
,
=
;
(4)(
+
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+
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×
+
×
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,
=
+(
+
),
=
+1,
=1
.
1 |
8 |
1 |
8 |
=0.125+3.7×0.125+0.125×5.3,
=0.125×(1+3.7+5.3),
=0.125×10,
=1.25;
(2)(4.6÷5+0.4×0.2)×2.8
=(0.92+0.08)×2.8,
=1×2.8,
=2.8;
(3)
9 |
10 |
5 |
9 |
1 |
2 |
1 |
6 |
=
9 |
10 |
5 |
9 |
1 |
3 |
=
9 |
10 |
5 |
3 |
=
3 |
2 |
(4)(
21 |
25 |
14 |
15 |
5 |
7 |
1 |
3 |
=
21 |
25 |
5 |
7 |
14 |
15 |
5 |
7 |
1 |
3 |
=
3 |
5 |
2 |
3 |
1 |
3 |
=
3 |
5 |
=1
3 |
5 |
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