题目内容
下面各题怎样简便就怎样算.
5÷(7÷11)÷(11÷16)÷(16÷35)
28.67×67+3
×286.7+573.4×
10×(4
+2
)-1÷12.5%
.
5÷(7÷11)÷(11÷16)÷(16÷35)
28.67×67+3
| 1 |
| 5 |
| 1 |
| 20 |
10×(4
| 2 |
| 5 |
| 1 |
| 2 |
| 1991+19911991+199119911991+… |
| 2002+20022002+200220022002+… |
(1)5÷(7÷11)÷(11÷16)÷(16÷35),
=5÷
÷
÷
,
=5×
×
×
,
=25;
(2)28.67×67+3
×286.7+573.4×
;
=28.67×67+3.2×286.7+573.4×0.05,
=28.67×67+32×28.67+28.67,
=(67+32+1)×28.67,
=100×28.67,
=2867;
(3)10×(4
+2
)-1÷12.5%,
=10×(4.4+2.5)-1÷
,
=10×6.9-1×
,
=69-8,
=61;
(4)
,
=
,
=
.
=5÷
| 7 |
| 11 |
| 11 |
| 16 |
| 16 |
| 35 |
=5×
| 11 |
| 7 |
| 16 |
| 11 |
| 35 |
| 16 |
=25;
(2)28.67×67+3
| 1 |
| 5 |
| 1 |
| 20 |
=28.67×67+3.2×286.7+573.4×0.05,
=28.67×67+32×28.67+28.67,
=(67+32+1)×28.67,
=100×28.67,
=2867;
(3)10×(4
| 2 |
| 5 |
| 1 |
| 2 |
=10×(4.4+2.5)-1÷
| 1 |
| 8 |
=10×6.9-1×
| 1 |
| 8 |
=69-8,
=61;
(4)
| 1991+19911991+199119911991+… |
| 2002+20022002+200220022002+… |
=
| 1991×(1+10001+100010001+…) |
| 2002×(1+10001+100010001+…) |
=
| 1991 |
| 2002 |
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