共30题用时5分钟
100-34=
90-45=
16×6-6=
90-55=
90-35=
32+3×20=
30-12=
180-72=
32+3-20=
80-29=
180-50=
56-7×8=
60-35=
90-33=
56÷7×8=
50-27=
180-107=
17×3+20=
80-16=
180-112=
78-12×4=
100-23=
360-170=
40-7×4=
40-11=
90-32=
15×3-25=
70-34=
100-54=
50+50×7=