计算下面各题,怎样算简便就怎样算.(1)936+250×16(2)7.2-2.7÷15-0.32(3)38×31+1÷83(4)910÷
计算下面各题,怎样算简便就怎样算.(1)936+250×16(2)7.2-2.7÷15-0.32(3)38×31+1÷83(4)910÷[12×(56?310)]....
计算下面各题,怎样算简便就怎样算.(1)936+250×16(2)7.2-2.7÷15-0.32(3)38×31+1÷83(4)910÷[12×(56?310)].
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(1)936+250×16,
=936+4000,
=4936;
(2)7.2-2.7÷15-0.32,
=7.2-0.18-0.32,
=7.2-(0.18+0.32),
=7.2-0.5,
=6.7;
(3)
×31+1÷
,
=
×31+1×
,
=
×(31+1)
=
×32,
=12;
(4))
÷[
×(
?
)],
=
÷[
×
],
=
÷
,
=
.
=936+4000,
=4936;
(2)7.2-2.7÷15-0.32,
=7.2-0.18-0.32,
=7.2-(0.18+0.32),
=7.2-0.5,
=6.7;
(3)
3 |
8 |
8 |
3 |
=
3 |
8 |
3 |
8 |
=
3 |
8 |
=
3 |
8 |
=12;
(4))
9 |
10 |
1 |
2 |
5 |
6 |
3 |
10 |
=
9 |
10 |
1 |
2 |
8 |
15 |
=
9 |
10 |
4 |
15 |
=
27 |
8 |
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