8hm3dam=8,3hm

chon B nhe

1.iron the clothes

2.move heavy things

99+1-80+80=100

a,45,75+25,5x3,5-35

=45,75+(25,5x3,5)-35

=45,75+89,25-35

=135-35

=100

b,166,32:46,2+16x0,4

=(166,32:46,2)+(16x0,4)

=3,6+6.4

=10

=989200

cac dong vat co o dia phuong em la: trau , bo , cho , meo ga , vit ,...

-Nhung chiec xe dang dau o cho mat duong doc nho co luc ma sat nghia ma no dung yen.

-Ma sat nghi giua ban chan va giup nguoi dung mat duong giup nguoi dung duoc ma khong bi nga.

-Luc ma sat truot can tro chuyen dong cua thung hang khi ta muon day thung hang.

-Khi truot tu tren cau truot xuong dat , giua lung ta va mat cau truot co luc ma sat.