脱式计算:(1)0.25×〔720÷(4-2.4×56)〕(2)〔149-8.19÷(5.25+134)〕×913÷17%(3)6713-(537-1713)+147(4)4.83×0.59+0.41×1.59-0.324×5.9(5)5.6-(□×314-156×□)÷523=235,□-数学
=
247 |
221 |
(3)6
7 |
13 |
3 |
7 |
7 |
13 |
4 |
7 |
=6
7 |
13 |
3 |
7 |
7 |
13 |
4 |
7 |
=6
49 |
91 |
39 |
91 |
49 |
91 |
52 |
91 |
=1
10 |
91 |
49 |
91 |
52 |
91 |
=4
7 |
13 |
(4)4.83×0.59+0.41×1.59-0.324×5.9,
=4.83×0.59+0.41×1.59-3.24×0.59,
=(4.83-3.24)×0.59+0.41×1.59,
=1.59×0.59+0.41×1.59,
=(0.59+0.41)×1.59,
=1×1.59,
=1.59;
(5)5.6-(□×3
1 |
4 |
5 |
6 |
2 |
3 |
3 |
5 |
5.6-(
17 |
12 |
2 |
3 |