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20 10 Shenzhen senior high school entrance examination 19 How to do the third question?
( 1) 16÷(3+ 1)×(2+8+9+7+3+ 1)= 120

(2)360÷30×4=48 degrees

(3) 120÷30×7=28

20÷30×3= 12

20÷30× 1=4

28×4.5= 126

12×5.5=66

4×6.5=24

(126+66+24) ×10000 = 2 160000 kg = 2160 tons.

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