9.5x3.125+37.5x0.095+0.45x95
=9.5×(3.125+0.375+4.5)
=9.5×8
=76
2.看不懂你写的
1/6+1/12+1/20+1/30+1/42+1/56
=1/2×1/3+1/3×1/4+×1/4×1/5+1/5×1/6+1/6×1/7+1/7×1/8
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/2-1/8
=3/8
1.75x18.35-【9又20分之7】x1.75+【2分之1】x3.5
=1.75×(18.35-9.35+1)
=17.5 因为 9又20分之7=9.35【2分之1】x3.5=1.75
666666x666666分之1+2+3+4+5+6+5+4+3+2+1
=36/666666x666666
=1/111111x111111
=1/12345654321
第6题同第3题
=1-1/7=6/7