
用简便方法计算(写出简算过程)①(13+14+16)×12 ...
用简便方法计算(写出简算过程)①(13+14+16)×12②18.93-658-338③163×34-0.75×62-75%④7512÷35+123×2712....
用简便方法计算(写出简算过程)①(13+14+16)×12 ②18.93-658-338③163×34-0.75×62-75% ④7512÷35+123×2712.
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①(
+
+
)×12,
=
×12+
×12+
×12,
=4+3+2,
=9;
②18.93-6
-3
,
=18.93-(6
+3
),
=18.93-10,
=8.93;
③163×
-0.75×62-75%,
=163×0.75-0.75×62-0.75,
=(163-62-1)×0.75,
=100×0.75,
=75;
④7
÷
+1
×2
,
=7
×
+
×2
,
=(7
+2
)×
,
=10×
,
=
.
1 |
3 |
1 |
4 |
1 |
6 |
=
1 |
3 |
1 |
4 |
1 |
6 |
=4+3+2,
=9;
②18.93-6
5 |
8 |
3 |
8 |
=18.93-(6
5 |
8 |
3 |
8 |
=18.93-10,
=8.93;
③163×
3 |
4 |
=163×0.75-0.75×62-0.75,
=(163-62-1)×0.75,
=100×0.75,
=75;
④7
5 |
12 |
3 |
5 |
2 |
3 |
7 |
12 |
=7
5 |
12 |
5 |
3 |
5 |
3 |
7 |
12 |
=(7
5 |
12 |
7 |
12 |
5 |
3 |
=10×
5 |
3 |
=
50 |
3 |
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