chieu rong cua khu vuon la

(65-5):2=30(m)

chieu dai cua khu vuon la

30+5=35(m)

dien tich cua khu vuon la

35 x 30=1050(m2)

dien tich trong hoa la

1050:3x2=700(m2)

đap so 700 (m2)

1+3+5+7+9+11+13+15+17+19

=(1+5)+(3+7)+(9+13)+(11+15)+(13+17)+(15+19)

=6+10+22+26+30+34

=16+48+64

=64+64

=128

15 x 25+25 x 34+51 x 25

=25 x(15+34+51)

=25 x 100

=2500

nhung cap cang vuong goc voi nhau :AB ED ,BC AE ,EA DC

nhung cap cang khong vuong goc vơi nhau CD AE

205336+1536:2

=205336+763

=206099

750000+2325 x 4-50300

=750000+9300

=759300-50300

=706000

38569034+70728129=109297163

3245762-1053881=2191881

13719 x 25 =342975

3384:36=94

3phut 20giay =200giay

2TA 54KG =245KG

105YEN = 1TAN 50YEN

1THE KI <1000NAM