简便运算题8道

0.9+9.9+99.9+999.9+9999.9
=10.8+99.9+999.9+9999.9
=1110.6+9999.9
=11110.5

8.8×1.25
=（8+0.8）×1.25
=8×1.25+0.8×1.25
=10+1
11

0.125×32×25
=0.125×（4×8）×25
=（0.125×8）×（4×25）
=1×100
=100

9999×2222+3333×3334
=3333×6666+3333×3334
=3333×（6666+3334）
=33330000

20072007×2008-20082008×2007
=2007×10001×2008-2008×10001×2007
=0

123.123×234-234.234×123
=123×1.001×234-234×1.001×123
=0

3.89×4.4+0.611×44
=3.89×4.4+6.11×4.4
=（3.89+6.11）×4.4
=10×4.4
=44

0.111×3.7+0.777×0.9
=0.111×3.7+0.111×6.3
=0.111×（3.7+6.3）
=0.111×10
=1.11本回答被提问者采纳

1-2+3-4+5-6+7-8`````+1999-2000
=-1+(-1)+(-1)+(-1)``````+(-1)
=-1000

0.25×32×0.125
=(0.25×4)×(8×0.125)
=1×1
=1

(5/12+1/6+3/4+2/3+11/24)×24
=5/12×24+1/6×24+3/4×24+2/3×24+11/24×24
=10+4+18+16+11
=59

301×99
=301×(100-1)
=301×100-301×1
=30100-301
=29799

(5000-9)+(50000-8)+(500000-7)+...+(50000000000-2)
=55555555000-44
=55555554956

3.25*101+6.75
=3.25*(100+1)+6.75
=3.25*100+3.25+6.75
=325+3.25+6.75
=325+(3.25+6.75)
=325+10
=335

2/3+2/15+2/35+2/63+2/99
＝2/（1*3)＋2/（3*5)＋2/（5*7)＋2/（7*9)＋2/（9*11)
＝1/1-1/3＋1/3-1/5＋1/5-1/7+1/7-1/9+1/9-1/11
＝1-1/11
＝10/11

27.3×3.6+36×7.27
＝2.73×36＋36×7.27
＝36×（2.73＋7.27）
＝36×10
＝360

(4.69×2.3+53.1×0.23)÷2.3
＝（4.69×2.3＋5.31×2.3）÷2.3
＝[2.3×（4.69+5.31）]÷2.3
＝2.3×10÷2.3
＝10