一、 直接写得数：(10分)1.4×0.2= 1/5 ＋1/4 = 2÷1/4 = 38.9＋1= 5/9 ×3/5 = 8 × 1/6= 2/7 ÷ 1/7= 1/6 ＋2/6 = 5-0.25 = 1÷1/5=
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一、直接写得数：(10分)1.4×0.2=1/5＋1/4=2÷1/4=38.9＋1=5/9×3/5=8×1/6=2/7÷1/7=1/6＋2/6=5-0.25=1÷1/5=一、直接写得数：(10分)1.
一、 直接写得数：(10分)1.4×0.2= 1/5 ＋1/4 = 2÷1/4 = 38.9＋1= 5/9 ×3/5 = 8 × 1/6= 2/7 ÷ 1/7= 1/6 ＋2/6 = 5-0.25 = 1÷1/5=
一、 直接写得数：(10分)
1.4×0.2= 1/5 ＋1/4 = 2÷1/4 = 38.9＋1= 5/9 ×3/5 =
8 × 1/6= 2/7 ÷ 1/7= 1/6 ＋2/6 = 5-0.25 = 1÷1/5=
一、 直接写得数：(10分)1.4×0.2= 1/5 ＋1/4 = 2÷1/4 = 38.9＋1= 5/9 ×3/5 = 8 × 1/6= 2/7 ÷ 1/7= 1/6 ＋2/6 = 5-0.25 = 1÷1/5=
1.4×0.2= 0.28 1/5 ＋1/4 =9/20 2÷1/4 =8 38.9＋1= 39.9 5/9 ×3/5 = 1/3
8 × 1/6=4/3 2/7 ÷ 1/7= 2 1/6 ＋2/6 =1/2 5-0.25 =4.75 1÷1/5=5