a. 45×41
1845
B. 121 : (450-439)
121: 11 =11
C. [( 157- 57) +25] :25 -5
(100 + 25) :25 - 5
125 :25 - 5
5-5= 0
D. {[(120+30):75 + 4]×100 - 200} :80
[(150 : 75 + 4)×100 -200] :80
(6 ×100 -200) :80
(600-200 ):80
400:80=5
G. 48 ×(18-2×9)
48 × (18-18)
48×0 =0
j. 4× [23 + 5× (23-4 ×4)]+ 1
4×(23 + 5 × 7)+1
4×(23+ 35)+1
4× 58 +1
232+1 =233
l. 9+8 × {76-5×[4+3×(9-8)]}
9+8 × [76-5×(4+3×1)]
9+8 × (76 - 5 × 7)
9+8 × (76 - 35)
9+8 × 41
9+328=337
