A:0.15×0.26=0.039
B:1-0.15×0.26=0.961
C:0.85×0.74=0.629
D:1-0.85×0.74=0.371
This problem seems difficult ____ (solve).
地震主要分布在地壳比较活跃的地带,是板块相互运动的结果。
15-9=____
8-3=____
9+3=____
14-4=____