1․
100:20=5
282:14=31
32:45=6
2.
14×5=448
74×2=148
85×5=425
3.
400:20=20
500:5=100
625:25=25
4.
4208=4×1000+2×100+0x10+8×1
5.
(41:8+10×5)+(200-100)=155
1․
100:20=5
282:14=31
32:45=6
2.
14×5=448
74×2=148
85×5=425
3.
400:20=20
500:5=100
625:25=25
4.
4208=4×1000+2×100+0x10+8×1
5.
(41:8+10×5)+(200-100)=155