27.5×3.7-8.5×3.7+3.7应该如何简便计算?
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解:27.5×3.7-8.5×3.7+3.7等于( 74 )
∵已知需求出27.5×3.7-8.5×3.7+3.7等于多少
X × Y - X × Z = X × (Y - Z)
∴27.5 × 3.7 - 8.5 × 3.7 + 3.7
= 3.7 × (27.5 - 8.5 + 1)
= (3×10+7)/10 × (19 + 1)
= 37/10 × 20
= 37 × 2
= 74
答:27.5×3.7-8.5×3.7+3.7等于74
∵已知需求出27.5×3.7-8.5×3.7+3.7等于多少
X × Y - X × Z = X × (Y - Z)
∴27.5 × 3.7 - 8.5 × 3.7 + 3.7
= 3.7 × (27.5 - 8.5 + 1)
= (3×10+7)/10 × (19 + 1)
= 37/10 × 20
= 37 × 2
= 74
答:27.5×3.7-8.5×3.7+3.7等于74
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