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=100-20 =(1 +2)-3/5
=80 (b) = 4 1/20 - 3/5
2. 9×12-10 = 3 9/20 (a)
=108-10 5. × ÷ 3/5
=98 (c) = 1 (b)
3. -15×3+20
=-45+20
=-25 (a)