364 +219 + 181 -164
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\(364+136+219+181\)
\(=\left(364+136\right)+\left(219+181\right)\)
\(=500+400\)
\(=900\)
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
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
\(a.98+3+97+2\)
\(=\left(98+2\right)+\left(97+3\right)\)
\(=100+100\)
\(=200\)
\(56+399+1+4\)
\(=\left(56+4\right)+\left(399+1\right)\)
\(=60+400\)
\(=460\)
\(b.364+136+219+181\)
\(=\left(364+136\right)+\left(219+181\right)\)
\(=500+400\)
\(=900\)
\(178+277+123+422\)
\(=\left(178+422\right)+\left(277+123\right)\)
\(=600+400\)
\(=1000\)
\(HocTot!!!\)
\(@VR\)
819 + 364 + 181 + 636 - 636 - 364 - 100 + 32 : 4
= 819 + 181 + 364 - 364 + 636 - 636 - 100 + 8
= 1000 + 0 + 0 - 100 + 8
= 1000 - 100 + 8
= 900 + 8
= 908
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
Bài 1 : Tính :
a, ( - 181 ) - ( - 219 ) - 819 + 281
b, [ 1919 - ( 216+1919)] + 1216
Mn giúp mk với !
Bài 1:
a) Ta có: (-181)-(-219)-819+281
=-181+219-819+281
=100-600
=-500
b) Ta có: [1919-(216+1919)]+1216
=1919-216-1919+1216
=1000
a)18 + 2 x y = 50
2 x y = 50 - 18
2 x y = 32
y = 32 : 2
y = 16
b)219 - (y - 19) = 100
(y - 19) = 219 - 100
(y - 19) = 119
y = 119 - 19
y = 100
c)2 x (y - 12) + 18 = 164
2 x (y - 12) = 164 - 18
2 x (y - 12) = 146
( y - 12 ) = 146 : 2
( y - 12 ) = 73
y = 73 - 12
y = 61
=600. Ha