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(1-0.2)^5*a=0.75
\frac{1.5}{(1.1 - 2.0 \div 1.3 \div 1.4)\times(1.2 - 1.9\div1.6)\times(1.8-1.7)} = 1 092 000
\frac{1.8}{(1.5-1.4)\times(1.3\div2.0-1.1\div1.7)\times(1.2-1.9\div1.6)}=489600
2\div(1.7\div1.9-1.6\div1.8)\div(1.5-1.4)\div(1.2\times1.1-1.3) = 171000
\frac{2.0}{(1.9-1.8)\times(1.7-1.6)\times(1.5-1.4)\times(1.2\times1.1-1.3)}=100000