Question

giúp em với=(( em cần gấp ạ:( cảm ơn mng

Answer 1

`2198+276+324`
`= 2 198 + ( 276+324)`
`= 2 198 + 600`
`= 2798`

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`135+360+265+140`
`=  (360+140)+(135+265) `
`= 500+400`
`= 900`

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`x+2021=4000`
`x=4000-2021`
`x=1979`

______________________________
`362+x=3362`
`x=3362-362`

`x=3000`

______________________
`376-x=126`
`x=376-126`
`x=250`

___________________________
`x-653=367`
`x=367+653`
`x=1020`

Answer 2

Tính 1 cách hợp lí :
a) 
2198+276+324
= 2 198 + ( 276+324)
= 2 198 + 600
= 2798.
b) 135+360+265+140
= (135+265) + (360+140)
= 400 + 500
= 900.
Bài 3 :
a) 
x+2021=4000
x=4000-2021
x=1979
b) 362+x=3362
x=3362-362

x=3000
c)376-x126
x=376-126
x=250
d)x-653=367
x=367+653
x=1020

Answer 3

Bài 2:

a) 2189 + 276 + 324

=  2189 + ( 324 + 276 )  

= 2189 + 600

= 2789

b) 135 + 360 + 265 + 140

= ( 135 + 265 ) + ( 360 + 140 ) 

= 400 + 500

= 900

Bài 3:

a) x + 2021 = 4000 

             x     = 4000 - 2021

             x     = 1979

b) 362 + x = 3362

              x = 3362 - 362

              x = 3000

c) 376 - x = 126 

             x = 376 - 126

             x = 250

d) x - 653 = 376 

           x   = 653 + 376

           x   = 1029