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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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.98+3+97+2\)
\(=\left(98+2\right)+\left(97+3\right)\)
\(=100+100\)
\(=200\)
\(56+399+1+4\)
\(=\left(56+4\right)+\left(399+1\right)\)
\(=60+400\)
\(=460\)
\(b.364+136+219+181\)
\(=\left(364+136\right)+\left(219+181\right)\)
\(=500+400\)
\(=900\)
\(178+277+123+422\)
\(=\left(178+422\right)+\left(277+123\right)\)
\(=600+400\)
\(=1000\)
\(HocTot!!!\)
\(@VR\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
879 × 5 + 4 × 879 + 879
=879 x (5 + 4) + 879
=879 x 9 + 879
=879 x (9+1)
=879 x 10
=8790
879x5+4x879+879
= 879x (5+4+10
= 879 x 10
= 8790
k mik nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{24}{9}+\dfrac{-a}{3}=\dfrac{36}{\dfrac{277}{5}}+\dfrac{-a}{4}=\dfrac{13}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
178 277 + 123 + 422
= (178 + 422) + (277 + 123)
= 600 + 400 = 1000
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 386 154 + 260 765
b, 726 485 – 52 936
c, 308 × 563
d, 5 176 : 35
b 4 277 nha