(10 11× 4.465 + 10 12× 0.3535) ÷ (160 × 10⁵) = 10 ?÷ 2 => (106(105× 4.465 + 106× 0.3535))/(105× 16) = 10?/2 => (105 (4.465 + 3.535))/16 = 10?/2 => 105 = 10? => ? = 5
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