只要面积相等的梯形都能拼成平行四边形。( )
纸条长(7)厘米()
98-49=59
()
(80-9.8)×-1.32 =70.2×-1.32 =28.08-1.32 =26.76()
18.1+(3-0.299÷0.23)×1 =18.1+1.6×1 =18.1+1.6 =19.7()