
选择合适的方法算.8.6-(5.6+4.8)÷1.3=
选择合适的方法算.8.6-(5.6+4.8)÷1.3=5×113×1310×45=4.5×5.12=3.5×10.1=4.05-2.8-0.7=48×(14+16-13)...
选择合适的方法算.8.6-(5.6+4.8)÷1.3= 5×113×1310×45= 4.5×5.12= 3.5×10.1= 4.05-2.8-0.7= 48×(14+16-13)=
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(1)8.6-(5.6+4.8)÷1.3,
=8.6-10.4÷1.3,
=8.6-8,
=0.6;
(2)5×
×
×
,
=(5×
)×(
×
),
=4×
,
=
;
(3)4.5×5.12=23.04;
4.5
;
(4)3.5×10.1,
=3.5×(10+0.1),
=3.5×10+3.5×0.1,
=35+0.35,
=35.35;
(5)4.05-2.8-0.7,
=4.05-(2.8+0.7),
=4.05-3.5,
=0.55;
(6)48×(
+
-
),
=48×
+48×
-48×
,
=12+8-16,
=4.
=8.6-10.4÷1.3,
=8.6-8,
=0.6;
(2)5×
1 |
13 |
13 |
10 |
4 |
5 |
=(5×
4 |
5 |
1 |
13 |
13 |
10 |
=4×
1 |
10 |
=
2 |
5 |
(3)4.5×5.12=23.04;
4.5
×5.12 |
90 |
|
. |
23.040 |
(4)3.5×10.1,
=3.5×(10+0.1),
=3.5×10+3.5×0.1,
=35+0.35,
=35.35;
(5)4.05-2.8-0.7,
=4.05-(2.8+0.7),
=4.05-3.5,
=0.55;
(6)48×(
1 |
4 |
1 |
6 |
1 |
3 |
=48×
1 |
4 |
1 |
6 |
1 |
3 |
=12+8-16,
=4.
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