共30题用时5分钟
90-40×2=
96-32÷16=
90-3×13=
350÷50+20=
120÷40+20=
(170+40)÷30=
72÷12×3=
180-36-44=
(95-20)÷25=
159-59-37=
40×(38+12)=
350÷(50+20)=
280÷5÷2=
160-(95-15)=
72÷(12×3)=
160÷40+40=
810÷(5×18)=
28+56÷28=
240÷4×20=
70+30×2=
50-20÷5=
(72-24)÷12=
159-59+41=
(120+30)×2=
(90-12)÷26=
120÷(60÷15)=
48-18÷6=
95-(74-50)=
6×(31-15)=
800-600÷20=