文档介绍：容易出错类型(共五种类型)
  600-60÷15                  20X4÷20X4 736-35X20                  25X4÷25X4
                     
98-18X5+25                 56X8÷56X8 280-80÷ 4                   12X6÷12X6
175-75÷25                25X8÷25X8 80-20X2+60                 36X9÷36X9
               
36-36÷6-6                  25X8÷(25X8) 100+45-100+45             15X97+3
100+1-100+1                  48X99+1 1000+8-1000+8               5+95X28
                     
102+1-102+1               65+35X13 25+75-25+75              40+360÷20-10
                                                                 
13+24X8 672-36+64 324-68+32 100-36+64
26×39+61×26 356×9-56×9 99×55+55
78×101-78 52×76+47×76+76 134×56-134+45×134
48×52×2-4×48 25×23×(40+4) 999×999+1999
184+98 695+202 864-199 738-301
380+476+120 (569+468)+(432+131) 704×25
256-147-53 373-129+29 189-(89+74)
28×4×25 125×32×25 9×72×125
720÷16÷5 630÷42 456-(256-36)
102×35 98×42 158+262+138 375+219+381+225
5001-247-1021-232 (181+2564)+2719 378+44+114+242+222
276+228+353+219 (375+1034)+(966+125) (2130+783+270)+1017
99+999+9999+99999 7755-(2187+755) 2214+638+286
3065-738-1065 899+344 2357-183-317-357
2365-1086-214 497-299 2370+1995
3999+498 1883-398 12×25 75×24
138×25×4 (13×125)×(3×8) (12+24+80)×50
25×32×125 32×(25+125) 88×125 102×76
178×101-178 84×36+64×84 75×99+2×75
98×199 123×18-123×3+85×123 50×(34×4)×3
25×(24+