Simple calculation (5.2-4.6) x4.6-0.9
(5.2-4.6)X4.6-0.9=0.6X4.6-0.9=0.6X4.6-0.6-0.3=0.6X(4.6-1-0.5)=0.6X3.1=0.6X(3+0.1)=0.6X3+0.1X0.6=1.86
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