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计算下列各题.28×16-209; 12+10×(14-0.2); (1...
计算下列各题.28×16-209;12+10×(14-0.2);(13-15)÷(1-78);(58+56)×425....
计算下列各题.28×16-209; 12+10×(14-0.2); (13-15)÷(1-78); (58+56)×425.
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①28×16-209
=448-209
=239;
②
+10×(
-0.2)
=
+10×
=
+
=1;
③(
-
)÷(1-
)
=
÷
=
×8
=1
;
④(
+
)×
=
×
+
×
=
+
=
.
=448-209
=239;
②
1 |
2 |
1 |
4 |
=
1 |
2 |
1 |
20 |
=
1 |
2 |
1 |
2 |
=1;
③(
1 |
3 |
1 |
5 |
7 |
8 |
=
2 |
15 |
1 |
8 |
=
2 |
15 |
=1
1 |
15 |
④(
5 |
8 |
5 |
6 |
4 |
25 |
=
5 |
8 |
4 |
25 |
5 |
6 |
4 |
25 |
=
1 |
10 |
2 |
15 |
=
7 |
30 |
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