74-0.4×0.7-0.72怎样简便计算?
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74-0.4×0.7-0.72怎样简便计算?74-0.4×0.7-0.72怎样简便计算?74-0.4×0.7-0.72怎样简便计算?74-0.4×0.7-0.72=74-0.28-0.72=74-（0
74-0.4×0.7-0.72怎样简便计算?
74-0.4×0.7-0.72怎样简便计算?
74-0.4×0.7-0.72怎样简便计算?
74-0.4×0.7-0.72
=74-0.28-0.72
=74-（0.28+0.72）
=74-1
=73
74-0.4×0.7-0.72
=74-0.28-0.72
=74-（0.28+0.72）
=74-1
=73
74-0.4*0.7-0.72
=74-0.28-0.72
=74-(0.28+0.72)
=74-1
=73