Question

$1) \frac{12-15}{15}:\frac{400-440}{440} =2,2$
$2) \frac{11-12}{12}: \frac{380-400}{400} = 1,6$
$3) \frac{7-11}{11} : \frac{320-380}{380}= 2,3$
$4) \frac{4-7}{7} : \frac{288-320}{320} =4,3$

Answer 1

1)(12-15):15:((400-440):440)=2.2

-3:15:(-40:440)=2.2

-0.2:(-1/11)=2.2

0.2*11=2.2

2.2=2.2

чтд

2)(11-12):12:((380-400):400)=1.6

-1/12:(-20:400)=1.6

-1/12:(-1/20)=1.6

1/12*20=1.6

1 2/3=1.6-неверно

3)(7-11):11:((320-380):380)=2.3

-4/11:(-60:380)=2.3

4/11*19/3=2.3

2 10/33=2.3-неверно

4)-3:7:(-32:320)=4.3

-3/7:(-0.1)=4.3

3/7*10=4.3

4 2/7=4.3-неверно