河北省财政局会计网:圆半径为a 厘米,如果半径增加10%,他的面积增加?%
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[(1+10%)^2-1]/1*100%=21%
S1=3.14*a^2
S2=3.14*(1.1a)^2=3.14*1.21*a^2
(S2-S1)/S1=21%
21%
21%
21%.
[(1+10%)^2-1]/1*100%=21%
S1=3.14*a^2
S2=3.14*(1.1a)^2=3.14*1.21*a^2
(S2-S1)/S1=21%
21%
21%
21%.