2×55×2            6×57×2            3×89×3

25＋65×6            4×55＋4            9＋19×1

40+2979        91-1841+32           5×55+5

100厘米1米        4×4+44×3             2米20厘米

20厘米2米    4厘米3米＋1米    73＋880

5＋52×5       3×43＋4        50－743

75-（24+12）39    36÷6+2740

24÷（8-2）24÷8-2    6×7+2020+6×7

52-15+1954    62-25-1819

45-29+6472    43+38+992

16+624              7486-9               27+996-60

4065-26              62+870              95-465+45