计算题：8y+w:W/f*R6A0D1w;r'e+^
16.8×2＋8.4＝5c:A4_0w7N/r3f*m,L8`4U'K8y+w:W/f*R6A0D1w;r'e+^
1.4×1.2－1.4＝+P/e7k1T2d7U2I8y+w:W/f*R6A0D1w;r'e+^
7.5×17＋3.5＝-P8S.R7L/X:z7F:?8|1b3}8a)I3I*u8A8y+w:W/f*R6A0D1w;r'e+^
（56.4＋63.6）×4.5＝1s.i0c3m+u7Q:t9k1l8J6Q+D+r8y+w:W/f*R6A0D1w;r'e+^
71×1.15＋6.35＝*f+|5v9N:]:G/~8y+w:W/f*R6A0D1w;r'e+^
7.5×4.2－8.4×3.5＝9r7E2h'k*F8y+w:W/f*R6A0D1w;r'e+^