0.16 0.4 1 《》 《》 15.625按规律填数

因为（-2.5）³=（-2.5）×（-2.5）×（-2.5）=-15.625,所以-2.5是-15.625的立方根

2.5

这种数列的首先考虑的是等比或者等差数列.
这种有小数点的,变化有较大的那种考虑等比数列.
很明显这个为等比数列.
第一个为6.25 第二个为0.4

0.375*四又八分之三减八分之三+15.625*37.5%
=0.375*四又八分之三-0.375+15.625*0.375
=0.375*(四又八分之三-1+15.625)
=0.375*19
=7.125
（7减一又三分之一除以4）*[0.2+三分之一除以三分之二]
=(7-3分之1）*(0.2+2分之1)
=3分之20*10分之7
=3分之14
=4又3分之2

展成分数形式：
15.625=15又八分之五＝125/8
显然这个分数的立方根为5/2=2.5

15.625 6.25 (2.5 )(1 )0.40.16
an=15.624*0.4^(n-1),n>=2

是0.375×4又3/8-3/8+15.625×37.5%
=0.375×4又3/8-0.375+15.625×0.375
=0.375×(4又3/8-1+15.625)
=0.375×19
=7.125

4乘（72-19）除以4+2
84.7×7－54.7×7
3.26×0.52+3.26×0.48+7.05
87.4×27.6+73.4×87.4－87.4
【10－（0.2+6.37÷0.7）】÷0.01
5.7×101 4.2×（12.5－7.5÷0.75）
30.8÷[14－(9.85＋1.07)]
[60－(9.5＋28.9)]÷0.18
2.881÷0.43－0.24×3.5
20×[(2.44－1.8)÷0.4＋0.15]
28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1
777×9+1111×3
0.8×〔15.5-(3.21+5.79)〕
（31.8+3.2×4）÷5
31.5×4÷(6+3)
0.64×25×7.8+2.2
2÷2.5+2.5÷2
194－64.8÷1.8×0.9
36.72÷4.25×9.9
5180－705×6
24÷2.4－2.5×0.8
(4121+2389)÷7
671×15-974
469×12+1492
405×(3213-3189)
3.416÷（0.016×35）
0.8×[(10－6.76)÷1.2]
19.4×6.1×2.3
5.67×0.2-0.62
18.1×0.92+3.93
0.0430.24+0.875
0.4×0.7×0.25
0.75×102 100-56.23
0.78+5.436+1
4.07×0.86+9.12.5
30.8÷[14－(9.85＋1.07)]
[60－(9.5＋28.9)]÷0.18
2.881÷0.43－0.24×3.5
20×[(2.44－1.8)÷0.4＋0.15]
28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1
777×9+1111×3
0.8×〔15.5-(3.21+5.79)〕
（31.8+3.2×4）÷5
31.5×4÷(6+3)
0.64×25×7.8+2.2
2÷2.5+2.5÷2
194－64.8÷1.8×0.9
36.72÷4.25×9.9
5180－705×6
24÷2.4－2.5×0.8
(4121+2389)÷7
671×15-974
469×12+1492
405×(3213-3189)
3.416÷（0.016×35）
0.8×[(10－6.76)÷1.2]
19.4×6.1×2.3 5.67×0.2-0.62
18.1×0.92+3.93 0.0430.24+0.875
0.4×0.7×0.25 0.75×102 100-56.23
0.78+5.436+1 4.07×0.86+9.12
30.8÷[14－(9.85＋1.07)]
[60－(9.5＋28.9)]÷0.18
2.881÷0.43－0.24×3.5
20×[(2.44－1.8)÷0.4＋0.15]
28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1
777×9+1111×3 0.8×〔15.5-(3.21+5.79)〕
（31.8+3.2×4）÷5 31.5×4÷(6+3)
0.64×25×7.8+2.2 2÷2.5+2.5÷2
194－64.8÷1.8×0.9 36.72÷4.25×9.9
5180－705×6 24÷2.4－2.5×0.8 (4121+2389)÷7
671×15-974 469×12+1492 405×(3213-3189)
3.416÷（0.016×35） 0.8×[(10－6.76)÷1.2]
19.4×6.1×2.3 5.67×0.2-0.62
18.1×0.92+3.93
0.0430.24+0.875
0.4×0.7×0.25
0.75×102 100-56.23
0.78+5.436+1 4.07×0.86+9.12.5 30.8÷[14－(9.85＋1.07)] [60－(9.5＋28.9)]÷0.18 2.881÷0.43－0.24×3.5 20×[(2.44－1.8)÷0.4＋0.15] 28-(3.4+1.25×2.4) 2.55×7.1+2.45×7.1 777×9+1111×3 0.8×〔15.5-(3.21+5.79)〕 （31.8+3.2×4）÷5 31.5×4÷(6+3) 0.64×25×7.8+2.2 2÷2.5+2.5÷2 194－64.8÷1.8×0.9 36.72÷4.25×9.9 5180－705×6 24÷2.4－2.5×0.8 (4121+2389)÷7 671×15-974 469×12+1492 405×(3213-3189) 3.416÷（0.016×35） 0.8×[(10－6.76)÷1.2] 19.4×6.1×2.3 5.67×0.2-0.62 18.1×0.92+3.93 0.0430.24+0.875 0.4×0.7×0.25 0.75×102 100-56.23 0.78+5.436+1 4.07×0.86+9.12.5
够了吧!

0.375×4又8分之3-8分之3+15.625×37.5℅
=0.375×4又3/8-0.375+15.625×0.375
=0.375×(4又3/8-1+15.625)
=0.375×19
=7.125
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15.625的立方根是2.5
所以X=2.5