问题
解答题
下面各题怎样简便就怎样算. 5÷(7÷11)÷(11÷16)÷(16÷35) 28.67×67+3
10×(4
|
答案
(1)5÷(7÷11)÷(11÷16)÷(16÷35),
=5÷
÷7 11
÷11 16
,16 35
=5×
×11 7
×16 11
,35 16
=25;
(2)28.67×67+3
×286.7+573.4×1 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
+22 5
)-1÷12.5%,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