列式．不计算：小王射击训练，命中18发，射空7发，命中率是百分之几？
直接写出得数． 1﹣= = = 23= 52= x•x•x== a×8×b= = = = 4×3×25=
计算下面各题．+1﹣+．
直接写出得数.= 1﹣40%= = 52= 1÷= =3﹣= = = = 0.8×÷=
看谁算得快．= 1﹣= = == 1﹣= = =1﹣= = = 1﹣=
怎样算简便就怎样算．①= ②= ③= ④= ．
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= 23= 52= x•x•x=
= a×8×b= 
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= 4×3×25=
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= 1﹣40%= 
= 52= 1÷
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= 0.8×
÷
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= 1﹣
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= 1﹣
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= 1﹣
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