{[42÷(4+2)]×[64-(20:5)]
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((42 ÷ (4 + 2)) × (64 - (20 ÷ 5))
= (42 ÷ 6) × (64 - 4)
= 7 × 60
= 420
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[tex](42 \div (4 + 2)) \times (64 - (20 \div 5))[/tex]
[tex]= (42 \div 6) \times (64 - 4)[/tex]
[tex]= 7 \times 60[/tex]
[tex]= 420[/tex]
