
脱式计算. 20÷57+16×456÷(45-815)×151-13-14÷1223+(47+0.5)×1415.
脱式计算.20÷57+16×456÷(45-815)×151-13-14÷1223+(47+0.5)×1415....
脱式计算. 20÷57+16×456÷(45-815)×151-13-14÷1223+(47+0.5)×1415.
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(1)20÷
+
×4
=28+
=28
;
(2)
÷(
-
)×15
=
÷
×15
=
×15
=
;
(3)1-
-
÷
=1-
-
=
-
=
;
(4)
+(
+0.5)×
=
+
×
=
+1
=1
.
5 |
7 |
1 |
6 |
=28+
2 |
3 |
=28
2 |
3 |
(2)
5 |
6 |
4 |
5 |
8 |
15 |
=
5 |
6 |
4 |
15 |
=
25 |
8 |
=
375 |
8 |
(3)1-
1 |
3 |
1 |
4 |
1 |
2 |
=1-
1 |
3 |
1 |
2 |
=
2 |
3 |
1 |
2 |
=
1 |
6 |
(4)
2 |
3 |
4 |
7 |
14 |
15 |
=
2 |
3 |
15 |
14 |
14 |
15 |
=
2 |
3 |
=1
2 |
3 |
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