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20 14 math sprint problem
1.( 1)4/ 13÷(7/ 10-3/5)=4/ 13÷(7/ 10-6/ 10)=4/ 13÷ 1/ 10=40/ 13。

(2)( 18+6)/45%= 160/3。

(3) 5000 * 26.15% * 5 * 5% = 326.875 yuan.

2.( 1)3/( 12+3)=20%/。

(2)① Cucumber area: 400 * 30% =120m2, Chinese cabbage area: 400 * 35% =140m2;

② The area of rape and green onion is 400-120-140 =140m2;

③ The yield of cucumber and Chinese cabbage is 8 * (120+140) = 2080 kg.

3.480÷( 1-40%)=800 yuan, 480×80%=384 yuan.

4.3×840÷(4+3+5)×5

=2520÷ 12×5

=2 10×5

= 1050 yuan.

5.2/3÷(2/3+ 1)=2/3÷5/3=2/3×3/5=40%.