计算下面各题.(1)2-14-13-34(2)0.8+58+0.2(3)15-5÷12-712(4)16+57+56+27(5)513+513+513(6)79+23-49.-五年级数学
=1-
1 |
3 |
=
2 |
3 |
(2)0.8+
5 |
8 |
=(0.8+0.2 )+
5 |
8 |
=1+
5 |
8 |
=1
5 |
8 |
(3)15-5÷12-
7 |
12 |
=15-
5 |
12 |
7 |
12 |
=15-(
5 |
12 |
7 |
12 |
=15-1,
=14;
(4)
1 |
6 |
5 |
7 |
5 |
6 |
2 |
7 |
=(
1 |
6 |
5 |
6 |
5 |
7 |
2 |
7 |
=1+1,
=2;
(5)
5 |
13 |
5 |
13 |
5 |
13 |
=
5 |
13 |
=
15 |
13 |
(6)