求几道小学四年级奥数试题（速算与巧算）

Answer 1

7.48+3.17-(2.48-6.83)
666652.5*88+880*33334.75
3.6*11.1+1.2*66.7
7.2*14.5+17*2.8
12.8*34.5+12.8*12.3+46.8*87.2
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Answer 2

1.25*3.14+1.25*2.75+1.25*2.29
41.2*8.1+11*1.25+(41.2+12.5)*1.9
5.2*1111+4.8*1111

Answer 3

25+36+25+25+25=
21+22+23+25*4=
9999*6666+3333*111222