×= 14-= ÷=
×500= += 10-=
4÷20= ×200= -=
÷15= ×= 4×=
+= ×99= 420÷35=
25×12= 135÷= 3/4 + 1/4 =
2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = -(+)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
÷17= +19= ÷=
×= ×= 1÷5=
6÷12= -=
1.(1+1/2)(1+1/3)(1+1/4) 2.(1-1/2)(1-1/3)(1-1/4)
+2-8+2 ×4/25×4 -(-)
+198 -202 +301
-99 +-+ -2456×21
-4× ×3/5 +++
-9036÷18 ×+ ×+×
×1/3 ×45-328 ×12
×+ ×5/6 23.(50-)/
×1/3 ×47+639 -1/6
×- ×1/5 ×+×
×4/5 +++ -1/2
×+* ×1/5 -420/12
-× +30/2+90/6 -1998.
-105×34 +× 41.(1/2+1/3+1/4) ×
42.(25+4) ×4 -4263/21 +
÷13×27 ×-÷ ×4 +×
48.(+ )×-768÷32 ×80-÷
-768÷32 ××4 +275×16
×15/8-1/12×9/5 +×(-) -45×12
+- -(+) ×1/4+23×25/100+
-- +× -×1/3
62.
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