求平行四边形的面积:底是8.5米,高比底长1.5米.
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= .
直接写出得数.+= ﹣= ﹣= 1﹣=﹣= +=
计算下列各题,能简算的要简算..