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B.student-students

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ko bt vẽ

a)7 x X - 8= 713                   b)648 - 34 x X = 44

  7 x X = 713 + 8                               34 x X = 204

  7 x X = 721                                             X = 204 : 34

         X = 721:7                                         X = 6

         X = 103                                            

1.Ø She suggests buying a new radio

2.Ø What’s the price of your new hat?

3.Ø This is the first time I have eaten spaghetti

4.Ø Staying at home in the rainy day is boring

5.Ø It’s 3 weeks since she last ate sushi at this restaurant

6.Ø The last time my brother came home was 5 weeks ago

7.Ø We have built this house for 3 months

8.Ø Because of not working hard, she is dismissed

a)(X - 3256) + 2589 = 12587 - 2658   

   (X - 3256) + 2589 = 9929

     X - 3256 = 9929 + 2589

     X - 3256 = 12418

     X            = 12418 +3256

     X            =

a)125879 - (X - 2597) = 52369 - 5879

   125879 - (X - 2597) = 46490

   125879 - X = 46490 - 2597

   125879 - X =  43893

                  X = 125879 - 43893

                  X = 81986

Bài 4:Giải:

Thời gian đi của chiếc cano là:

7h45 - 6h30 = 1,25(h)

Vận tốc của chiếc cano là:

30 : 1,25= 24(km/h)

Bài 5: Giải:

Thời gian đi là

11-8h20=2h40'=\(\dfrac{8}{3}\)

Độ dài quãng đường là:

\(\dfrac{8}{3}\)x 42 = 112 (km)