529673836
幼苗
共回答了21个问题采纳率:90.5% 举报
①2009×97.75+4018×1.125,
=2009×97.75+2009×2×1.125,
=2009×(97.75+2.25),
=2009×100,
=200900;
②4.02×8.1×
3
5 ÷(0.6×0.81),
=4.02×8.1×0.6÷0.6÷0.81,
=4.02×(8.1÷0.81)×(0.6÷0.6),
=4.02×10×1,
=40.2;
③9999×8888÷6666,
=9999×8×1111÷6666,
=9999×8×(1111÷6666),
=9999×8×
1
6 ,
=13332;
④ 3.6×1994
2
5 +2006.9×6
2
5 ,
=3.6×1994.4+2006.9×6.4,
=3.6×(2000-5.6)+(2000+6.9)×6.4,
=(3.6+6.4)×2000-3.6×5.6+6.9×6.4,
=10×2000+6.9×6.4-3.6×5.6,
=20000+0.3×23×0.8×8-0.3×12×0.8×7,
=20000+0.3×0.8×(23×8-12×7),
=20000+0.24×(184-84),
=20000+24,
=20024;
⑤设1+0.93+0.34=a,1+0.93+0.34+0.65=b,
(1+0.93+0.34)×(0.93+0.34+0.65)-(1+0.93+0.34+0.65)×(0.93+0.34),
=a×(b-1)-b×(a-1),
=ab-a-ab+b,
=b-a,
=(1+0.93+0.34+0.65)-(1+0.93+0.34),
=0.65;
⑥ 0.
•
3 +0.1
•
1 +0.1
•
2 +0.1
•
3 +0.1
•
4 +0.1
•
5 ,
=
30
90 +
10
90 +
11
90 +
12
90 +
13
90 +
14
90 ,
=1.
1年前
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