过O点画AC边的垂线,画AB边的平行线。
口算= = = == = = =
直接写出得数.= = 11= == 0÷1.2= = == = = =12= = = 54=
直接写出得数×= ×= ×18= ÷8=6÷= ××= ÷= ÷=÷÷= 0.25+= ﹣= ÷×=÷= ×= 8﹣4÷= ﹣=÷14= 12×(﹣)= 5%×5= +++=3.75+= 63%﹣27%= (1﹣20%)÷20%= 0.4÷=×1.8= ×25%=
口算.= = = == =
直接写出得数.×= 16×= ÷= 9÷=÷33= 1﹣25%= 75%+0.25= ﹣=