0.99X9.5怎么简便?
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解:0.99X9.5等于( 1881/200 ),【即等于9.405】
∵已知需求出0.99X9.5等于多少
A × (B - C)= A × B - A × C
∴0.99 X 9.5
= (1 - 0.01)× 9.5
= 1 × 9.5 - 0.01 × 9.5
= 1 × (9×10+5)/10 - 1/100 × (9×10+5)/10
= 95/10 - 1/100 × 95/10
= 19/2 - 1/100 × 19/2
= 19/2 - 19/200
= 1900/200 - 19/200
= 1881/200
= 9.405
答:0.99X9.5等于1881/200,【即等于9.405】
∵已知需求出0.99X9.5等于多少
A × (B - C)= A × B - A × C
∴0.99 X 9.5
= (1 - 0.01)× 9.5
= 1 × 9.5 - 0.01 × 9.5
= 1 × (9×10+5)/10 - 1/100 × (9×10+5)/10
= 95/10 - 1/100 × 95/10
= 19/2 - 1/100 × 19/2
= 19/2 - 19/200
= 1900/200 - 19/200
= 1881/200
= 9.405
答:0.99X9.5等于1881/200,【即等于9.405】
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