⑤ A 3: ① 0 10/3 270 4.75 450 10 0 33 ② 3.7×99+3.7 =3.7×﹙99+1﹚ =370 1.05×﹙3--0.9﹚6.3 =1.05×2.1÷6.3 =1.05÷﹙6.3÷2.1﹚ =1.05÷3 =0.35 9/20÷[1/2×﹙2/5+4/5﹚] =9/20÷[1/2×6/5] =9/20×5/3 =3/4 ③ 解 8.3x=16.6 x=2 解 1/2x=1/41/6 x=1/4×1/6×2 x=1/12 4: ① 摸到红桃 1/2 摸到黑桃 1/4 ② 3/4 |
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