计算题:;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i
16.8×2+8.4=,P/i.y;g0d.I;v;|(~;n;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i
1.4×1.2-1.4=9a3I5I)~9u;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i
7.5×17+3.5=,E5d*h3j9U7P-I:x2P2v0T;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i
(56.4+63.6)×4.5=6A*N0u(p)o'x1g;N6@/U0V3c;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i
71×1.15+6.35=-h7U5F;T/t;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i
7.5×4.2-8.4×3.5=-R5u:P4F1W0v6E,{8E*O3_)D;O*V;B7z;s:O6k/t2~/?.e3w;|0a+n:f'y-i