a) 98 + 3 + 97 +2

= (98 +2) + ( 97 + 3)

= 100 + 100 = 200

56 + 399 + 1 + 4

= (56 + 4) +( 399 + 1)

= 60 + 400 = 460

b) 364 + 136 + 219 + 181

= (364 + 136) + (219 + 181

= 500 + 400 = 900

178 277 + 123 + 422

= (178 + 422) + (277 + 123)

= 600 + 400 = 1000

tính bang cach thuyen tien nhat;236+400+364=.......

\(a.98+3+97+2\)

\(=\left(98+2\right)+\left(97+3\right)\)

\(=100+100\)

\(=200\)

\(56+399+1+4\)

\(=\left(56+4\right)+\left(399+1\right)\)

\(=60+400\)

\(=460\)

\(b.364+136+219+181\)

\(=\left(364+136\right)+\left(219+181\right)\)

\(=500+400\)

\(=900\)

\(178+277+123+422\)

\(=\left(178+422\right)+\left(277+123\right)\)

\(=600+400\)

\(=1000\)

\(HocTot!!!\)

\(@VR\)

 364+136+219+181

=(364+136)+(219+181)

=500+400

=900

       \(364+136+219+181\)

\(=\left(364+136\right)+\left(219+181\right)\)

\(=500+400\)

\(=900\)

364+136+219+181

=(364+136)+(219+181)

=       500   +       400

=                900

a) 98+3+97+2
= (98+2)+(97+3)
= 100 + 100
= 200

 56+399+1+4
= (56+4)+(399+1)
= 60 + 400
= 460

b)364+136+219+181
= (364+136)+(219+181)
= 500 + 400
= 900

 178+277+123+422
= (178+422)+(277+123)
= 600 + 400
= 1000
 

a) 98+3+97+2
= (98+2)+(97+3)
= 100 + 100
= 200

 56+399+1+4
= (56+4)+(399+1)
= 60 + 400
= 460

b)364+136+219+181
= (364+136)+(219+181)
= 500 + 400
= 900

 178+277+123+422
= (178+422)+(277+123)
= 600 + 400
= 1000

200

460

900

1000

98+3+97+2=(98+2)+(97+3)

=100+100=200

56+399+1+4=(56+4)+(399+1)

=60+400

=460

364+136+219+181=(364+136)+(219+181)

=500+400=900

178+277+123+422=(178+422)+(277+123)

600+400=1000

98+3+97+2=(98+2)+(97+3)=100+100=200

56+399+1+4=(56+4)+(399+1)=60+400=460

364+136+219+181=(364+136)+(219+181)=500+400=900

178+277+123+422=(178+422)+(277+123)=600+400=1000

Bài 5:

a: 2x=10

nên x=5

b: x:6=5

nên x=30

178 277 + 123 + 422

= (178 + 422) + (277 + 123)

= 600 + 400 = 1000

178 +277 + 123 + 422

= ( 178 + 422 ) + ( 277 + 123 )

= 600 +400

= 1000