9.9×7+3.3×6简算?
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解:9.9×7+3.3×6等于( 891/10 ),【即等于89.1】
∵已知需求出9.9×7+3.3×6等于多少
X × Y + X × Z = X × (Y + Z)
∴9.9 × 7 + 3.3 × 6
= 3.3 × 3 × 7 + 3.3 × 6
= 3.3 × (3 × 7 + 6)
= (3×10+3)/10 × (21 + 6)
= 33/10 × 27
= (33×27)/10
= 891/10
= 89.1
答:9.9×7+3.3×6等于891/10,【即等于89.1】
∵已知需求出9.9×7+3.3×6等于多少
X × Y + X × Z = X × (Y + Z)
∴9.9 × 7 + 3.3 × 6
= 3.3 × 3 × 7 + 3.3 × 6
= 3.3 × (3 × 7 + 6)
= (3×10+3)/10 × (21 + 6)
= 33/10 × 27
= (33×27)/10
= 891/10
= 89.1
答:9.9×7+3.3×6等于891/10,【即等于89.1】
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