0.5除以0.2-0.2除以0.5的简便运算和1.93除以(1除以0.8-0.6)的简便运算

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0.5除以0.2-0.2除以0.5的简便运算和1.93除以(1除以0.8-0.6)的简便运算
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0.5除以0.2-0.2除以0.5的简便运算和1.93除以(1除以0.8-0.6)的简便运算
0.5除以0.2-0.2除以0.5的简便运算和1.93除以(1除以0.8-0.6)的简便运算

0.5除以0.2-0.2除以0.5的简便运算和1.93除以(1除以0.8-0.6)的简便运算
0.5除以0.2-0.2除以0.5
=2.5-0.4
=2.1
1.95除以(1除以0.8-0.6)
=1.95÷(1.25-0.6)
=1.95÷0.65
=3

0.5÷0.2-0.2÷0.5=5/2-2/5=5/2[1-(2/5)²]=5/2×(1-4/25)=5/2×21/25=21/10
1.93÷(1÷0.8-0.6)=1.93÷(5/4-3/5)=1.93×20/13=38.6/13=192/65
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