
用适当的方法计算. 3.5×45+5.5×80%+0.8  ...
用适当的方法计算.3.5×45+5.5×80%+0.8845÷[7.8+14×(2.75+1.25)]45÷[(35?14)÷710]....
用适当的方法计算. 3.5×45+5.5×80%+0.8 845÷[7.8+14×(2.75+1.25)] 45÷[(35?14)÷710].
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(1)3.5×
+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(2)8
÷[7.8+
×(2.75+1.25)],
=8
÷[7.8+
×4],
=8
÷[7.8+1],
=8.8÷8.8,
=1;
(3)
÷[(
?
)÷
],
=
÷[
÷
],
=
÷
,
=
.
4 |
5 |
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(2)8
4 |
5 |
1 |
4 |
=8
4 |
5 |
1 |
4 |
=8
4 |
5 |
=8.8÷8.8,
=1;
(3)
4 |
5 |
3 |
5 |
1 |
4 |
7 |
10 |
=
4 |
5 |
7 |
20 |
7 |
10 |
=
4 |
5 |
1 |
2 |
=
8 |
5 |
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