计算下列各题(能简算的一定要简算) 480÷12-24×1.5 11.7+133+3.3+23 17×114÷(16+3
计算下列各题(能简算的一定要简算)480÷12-24×1.511.7+133+3.3+2317×114÷(16+34)509×[2.5-4.5×(15+13)]...
计算下列各题(能简算的一定要简算) 480÷12-24×1.5 11.7+133+3.3+23 17×114÷(16+34) 509×[2.5-4.5×(15+13)]
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(1)480÷12-24×1.5,
=40-36,
=4;
(2)11.7+
+3.3+
,
=(11.7+3.3)+(
+
),
=15+5,
=20;
(3)
×
÷(
+
),
=
×
÷
,
=
×(
×
),
=
×3,
=
;
(4)
×[2.5-4.5×(
+
)],
=
×[2.5-(4.5×
+4.5×
)],
=
×[2.5-(0.9+1.5)],
=
×[2.5-2.4],
=
×0.1,
=
.
=40-36,
=4;
(2)11.7+
13 |
3 |
2 |
3 |
=(11.7+3.3)+(
13 |
3 |
2 |
3 |
=15+5,
=20;
(3)
1 |
7 |
11 |
4 |
1 |
6 |
3 |
4 |
=
1 |
7 |
11 |
4 |
11 |
12 |
=
1 |
7 |
11 |
4 |
12 |
11 |
=
1 |
7 |
=
3 |
7 |
(4)
50 |
9 |
1 |
5 |
1 |
3 |
=
50 |
9 |
1 |
5 |
1 |
3 |
=
50 |
9 |
=
50 |
9 |
=
50 |
9 |
=
5 |
9 |
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