下面各题怎样简便就怎样算.5÷(7÷11)÷(11÷16)÷(16÷35)28.67×67+315×286.7+573.4×12010×(425+212)-1÷12.5%1991+19911991+1

题目简介

下面各题怎样简便就怎样算.5÷(7÷11)÷(11÷16)÷(16÷35)28.67×67+315×286.7+573.4×12010×(425+212)-1÷12.5%1991+19911991+1

题目详情

下面各题怎样简便就怎样算.
5÷(7÷11)÷(11÷16)÷(16÷35)
28.67×67+3
1
5
×286.7+573.4×
1
20

10×(4
2
5
+2
1
2
)-1÷12.5%
1991+19911991+199119911991+…
2002+20022002+200220022002+…
题型:解答题难度:中档来源:不详

答案

(1)5÷(7÷11)÷(11÷16)÷(16÷35),
=5÷class="stub"7
11
÷class="stub"11
16
÷class="stub"16
35

=5×class="stub"11
7
×class="stub"16
11
×class="stub"35
16

=25;

(2)28.67×67+3class="stub"1
5
×286.7+573.4×class="stub"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×(4class="stub"2
5
+2class="stub"1
2
)-1÷12.5%,
=10×(4.4+2.5)-1÷class="stub"1
8

=10×6.9-1×class="stub"1
8

=69-8,
=61;

(4)class="stub"1991+19911991+199119911991+…
2002+20022002+200220022002+…

=
1991×(1+10001+100010001+…)
2002×(1+10001+100010001+…)

=class="stub"1991
2002

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