7 |
18 |
7 |
18 |
=
7 |
18 |
=
7 |
18 |
=14;
(2)
11 |
13 |
11 |
13 |
11 |
13 |
=
11 |
13 |
=
11 |
13 |
=77;
(3)24×
51 |
43 |
19 |
43 |
=24×
51 |
43 |
51 |
43 |
=(24+19)×
51 |
43 |
=43×
51 |
43 |
=51;
(4)69×
13 |
54 |
15 |
54 |
=23×
13 |
18 |
13 |
18 |
=(23-5)×
13 |
18 |
=18×
13 |
18 |
=13.
7 |
18 |
7 |
18 |
11 |
13 |
11 |
13 |
11 |
13 |
51 |
43 |
19 |
43 |
13 |
54 |
15 |
54 |
7 |
18 |
7 |
18 |
7 |
18 |
7 |
18 |
11 |
13 |
11 |
13 |
11 |
13 |
11 |
13 |
11 |
13 |
51 |
43 |
19 |
43 |
51 |
43 |
51 |
43 |
51 |
43 |
51 |
43 |
13 |
54 |
15 |
54 |
13 |
18 |
13 |
18 |
13 |
18 |
13 |
18 |