(3/4+1/5-5/12)×2.4等于多少简便运算?
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解:(3/4+1/5-5/12)×2.4等于( 32/25 ),【即等于1.28】
∵已知需求出(3/4+1/5-5/12)×2.4等于多少
∴(3/4 + 1/5 - 5/12) × 2.4
= (45/60 + 12/60 - 25/60)× (2×10+4)/10
= (57/60 - 25/60)× 24/10
= 32/60 × 12/5
= 8/15 × 12/5
= 32/25
= 1.28
答:(3/4+1/5-5/12)×2.4等于32/25,【即等于1.28】
∵已知需求出(3/4+1/5-5/12)×2.4等于多少
∴(3/4 + 1/5 - 5/12) × 2.4
= (45/60 + 12/60 - 25/60)× (2×10+4)/10
= (57/60 - 25/60)× 24/10
= 32/60 × 12/5
= 8/15 × 12/5
= 32/25
= 1.28
答:(3/4+1/5-5/12)×2.4等于32/25,【即等于1.28】
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