用简便方法计算。 4.2÷0.35 5.6÷3.5 0.49÷104 8.1÷4.5
4个回答
2019-02-19
展开全部
4.2÷0.35
=4.2÷(0.7÷2)
=4.2÷0.7×2
=6×2
=12,
——————
5.6÷3.5
=5.6÷(7÷2)
=5.6÷7×2
=0.8×2
=1.6,
——————
0.49÷104没有简便算法。
——————
8.1÷4.5
=8.1÷(9÷2)
=8.1÷9×2
=0.9×2
=1.8
=4.2÷(0.7÷2)
=4.2÷0.7×2
=6×2
=12,
——————
5.6÷3.5
=5.6÷(7÷2)
=5.6÷7×2
=0.8×2
=1.6,
——————
0.49÷104没有简便算法。
——————
8.1÷4.5
=8.1÷(9÷2)
=8.1÷9×2
=0.9×2
=1.8
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展开全部
4.2÷0.35
=4.2÷0.7÷0.5
=6÷0.5
=12
5.6÷3.5
=5.6÷0.7÷5
=8÷5
=1.6
0.49÷14
=0.49÷7÷2
=0.07÷2
=0.035
8.1÷4.5
=8.1÷0.9÷5
=9÷5
=1.8
=4.2÷0.7÷0.5
=6÷0.5
=12
5.6÷3.5
=5.6÷0.7÷5
=8÷5
=1.6
0.49÷14
=0.49÷7÷2
=0.07÷2
=0.035
8.1÷4.5
=8.1÷0.9÷5
=9÷5
=1.8
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