Question

1, tìm x

5.x-7=13

2, tính nhanh

281+129+219

 

Answer 1

1a, 4

2, 281+129+219=629

Answer 2

1)4

2)629

Answer 3

\(5.x-7=13\)

\(5.x=13+7\)

\(5.x=20\)

\(x=20:5\)

\(x=4\)

\(281+129+219\)

\(=\left(281+219\right)+129\)

\(=500+129\)

\(=629\)

Answer 4

5.x-7=13

5.x=13+7

5.x=20

X=20:5

X=4

281+129+219

=(281+219)+129

=500+129

=729