
计算下面各题,能简算的要简算.158+57+838;2.75÷8+0.125×4.25+12.5%;24×(712+56-34); ...
计算下面各题,能简算的要简算.158+57+838;2.75÷8+0.125×4.25+12.5%;24×(712+56-34);89×[34+(716-38)]....
计算下面各题,能简算的要简算.158+57+838;2.75÷8+0.125×4.25+12.5%;24×(712+56-34); 89×[34+(716-38)].
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(1)1
+
+8
=(1
+8
)+
=10+
=10
(2)2.75÷8+0.125×4.25+12.5%
=2.75×
+
×4.25+
=(2.75+4.25+1)×
=8×
=1
(3)24×(
+
-
)
=24×
+24×
-24×
=14+20-18
=16
(4)
×[
+(
-
)]
=
×[
+
]
=
×
=
5 |
8 |
5 |
7 |
3 |
8 |
=(1
5 |
8 |
3 |
8 |
5 |
7 |
=10+
5 |
7 |
=10
5 |
7 |
(2)2.75÷8+0.125×4.25+12.5%
=2.75×
1 |
8 |
1 |
8 |
1 |
8 |
=(2.75+4.25+1)×
1 |
8 |
=8×
1 |
8 |
=1
(3)24×(
7 |
12 |
5 |
6 |
3 |
4 |
=24×
7 |
12 |
5 |
6 |
3 |
4 |
=14+20-18
=16
(4)
8 |
9 |
3 |
4 |
7 |
16 |
3 |
8 |
=
8 |
9 |
3 |
4 |
1 |
16 |
=
8 |
9 |
13 |
16 |
=
13 |
18 |
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