由题意得 |x−254|
区域
SS(%)
Ss(%)
ss(%)
A
80
18
2
B
8
90
1516 ÷5=____
3÷ 38 =____
3× 56 +0=____
(1﹣ 27 )×14=____
417 × 34 =____
14 ×3.6=____
89 ÷ 29 =____
5﹣ 58 × 85 =____