下面各题,能简便计算的要用简便方法计算.68×35-408÷24 57+98×79+18(0.63-0.63÷3)×0.53.
下面各题,能简便计算的要用简便方法计算.68×35-408÷2457+98×79+18(0.63-0.63÷3)×0.53.64÷4+4.36×0.251.3-3.79+...
下面各题,能简便计算的要用简便方法计算.68×35-408÷24 57+98×79+18(0.63-0.63÷3)×0.53.64÷4+4.36×0.25 1.3-3.79+9.7-6.21 322÷[54÷(143-12)].
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(1)68×35-408÷24
=2380-17
=2363;
(2)
+
×
+
=
+(
+
)
=
+1
=1
;
(3)(0.63-0.63÷3)×0.5
=(0.63-0.21)×0.5
=0.42×0.5
=0.21;
(4)3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(5)1.3-3.79+9.7-6.21
=1.3+9.7-(3.79+6.21)
=11-10
=1;
(6)
÷[
÷(
-
)]
=
÷[
×
]
=
×
=
.
=2380-17
=2363;
(2)
5 |
7 |
9 |
8 |
7 |
9 |
1 |
8 |
=
5 |
7 |
7 |
8 |
1 |
8 |
=
5 |
7 |
=1
5 |
7 |
(3)(0.63-0.63÷3)×0.5
=(0.63-0.21)×0.5
=0.42×0.5
=0.21;
(4)3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(5)1.3-3.79+9.7-6.21
=1.3+9.7-(3.79+6.21)
=11-10
=1;
(6)
3 |
22 |
5 |
4 |
14 |
3 |
1 |
2 |
=
3 |
22 |
5 |
4 |
6 |
25 |
=
3 |
22 |
10 |
3 |
=
5 |
11 |
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