1: 3.5 0.35 0.035
0.35 0.035
2: 0.0448 0.8692
0.045 0.0756
3: 1.4×0.6=0.84
0.6×0.6=0.36
0.84--0.36=0.48
4: 0.008×2.5=0.02
0.008×0.65=0.0052
5: 8.4×15.7=131.88
6: ⑴ 23.5×﹙1+1.4﹚
=23.5×2.4
=56.4
⑵ 23.5×(1.4--1)
=23.5×0.4
=9.4
7: 0.36
0.4356
0.443556
0.44435556
0.4444355556
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