1: > < > > < > 2: 7 7×1 7 ----- = ----------- =----- 8 8×1 8 3 3×2 6 -------= ----------- = ------ 7/8>3/4 4 4×2 8 5 5×3 15 ------- = ---------- = -------- 6 6×3 18 7 7×2 14 ------ = ----------- = ------- 5/6>7/9 9 9×2 18 11 11×7 77 ------- = ------------ = ---------- 5 5×7 35 15 15×5 75 -------- = -------------- = -------- 11/5>15/7 7 7×5 35 3 3× 2 6 -------- = ----------- = ------- 10 10×2 20 1 1×5 5 -------- = ------------- = ----- 3/10>1/4 4 4×5 20 3: 4/7>3/7 3/8<5/6 3/4<5/6 9/4>11/5 4: 18÷30=18/30 12÷18=12/18 18/30<12/18 第二组快 5: 1/6<5/24<3/8<5/12 |