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1: x 1 ---------- = ---------- 4200 100000 100000x=4200×1 x=0.042
2.8 1 ----------- = -------- x 20000 x=2.8×20000 x=56000
4∶6=1/2∶x 4x=6×1/2 3-x=3/4
2: 量得图上为3.5cm ① 3.5×80000=280000cm=2800m ② 略
3: 22km=2200000cm 2200000÷100000=22
4: 19.6×10000000cm =196000000cm =1960km | 