题目内容
脱式计算,能简算的要简算
(1)
-
÷
×
(2)(
+
)×45
(3)12.87+3.65+1.35
(4)74.6×19+19×25.4
(5)[1-(
-
)]÷
(6)168.1÷(4.5×2-0.8)
(1)
| 4 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 2 |
(2)(
| 2 |
| 3 |
| 4 |
| 15 |
(3)12.87+3.65+1.35
(4)74.6×19+19×25.4
(5)[1-(
| 3 |
| 4 |
| 1 |
| 6 |
| 2 |
| 3 |
(6)168.1÷(4.5×2-0.8)
(1)
-
÷
×
=
-
×
×
=
-
=
;
(2)(
+
)×15
=
×15
=14;
(3)12.87+3.65+1.35
=12.87+(3.65+1.35)
=12.87+5
=17.87;
(4)74.6×19+19×25.4
=(74.6+25.4)×19
=100×19
=1900;
(5)【1-(
-
)】÷
=【1-
】×
=
×
=
;
(6)168.1÷(4.5×2-0.8)
=168.1÷8.2
=20.5;
| 4 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 4 |
| 5 |
| 4 |
| 5 |
| 3 |
| 2 |
| 1 |
| 2 |
=
| 4 |
| 5 |
| 3 |
| 5 |
=
| 1 |
| 5 |
(2)(
| 2 |
| 3 |
| 4 |
| 15 |
=
| 14 |
| 15 |
=14;
(3)12.87+3.65+1.35
=12.87+(3.65+1.35)
=12.87+5
=17.87;
(4)74.6×19+19×25.4
=(74.6+25.4)×19
=100×19
=1900;
(5)【1-(
| 3 |
| 4 |
| 1 |
| 6 |
| 2 |
| 3 |
=【1-
| 7 |
| 12 |
| 3 |
| 2 |
=
| 5 |
| 12 |
| 3 |
| 2 |
=
| 5 |
| 8 |
(6)168.1÷(4.5×2-0.8)
=168.1÷8.2
=20.5;
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