8.4÷0.21÷0.5简便运算急用!

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8.4÷0.21÷0.5简便运算急用!8.4÷0.21÷0.5简便运算急用!8.4÷0.21÷0.5简便运算急用!8.4÷0.21÷0.5各个数扩大100倍即840/21/50=40/50=0.8因为

8.4÷0.21÷0.5简便运算急用!
8.4÷0.21÷0.5简便运算急用!

8.4÷0.21÷0.5简便运算急用!
8.4÷0.21÷0.5
各个数扩大100倍
即840/21/50=40/50=0.8
因为是扩大一百倍
所以0.8*100=80

8.4÷0.21÷0.5
=40x0.21÷0.21÷0.5
=40÷0.5
=40x2
=80

8.4÷0.21÷0.5
=8.4÷0.21x2
=8.4÷2.1x20
=4x20
=80