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How to write three questions, 7, 8 and 9, on page 24 of the second volume of the mathematics book of the sixth grade Jiangsu Education Edition?
p24/7、30*30=900(cm？ )

16 * 3. 14 * 10 = 502.4(cm？ )

(502.4+900)*20=28048(cm？ )=280.48(dm？ )

p24/8、0.5*2*3.5= 10.99(m？ )

(0.5? * 3.14+10.99) * 42 = 494.55 = 495 (flowers)

P24/9, 3. 14*3/0.5*5=23.55 (kg)

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