47+58+83-29-17-53
= (47 - 17) + ( 83 - 53 ) + ( 58 - 29 )
= 30 + 30 + 29
= 60 + 29
= 89
co tien ko ban
tinh bang cach thuan tien nhat
53+8x53+53
4+9+8+6+2+1+3+7=
tinh nhanh va thuan tien
ai nhanh va day du nhat thi minh tk cho
viet tiep cao cho cham ..
3, 6, 12,...,....,.....,....,
Tinh bang cach thuan tien nhat..
57+129+15+21+33+45
so be nhat co ba chu so khac nhau chia cho 8 duoc thuong va so du la bao nhieu?
1+2+3+4+5+6+7+8+9
tinh bang cach thuan tien nhat
mot hinh chu nhat co chieu dai gap 4 lan chieu rong .neu tang chieu rong 72cm va giu nguyen chieu dai thi duoc hinh vuong .tinh chu vi hinh chu nhat
ai lam nhanh minh tich cho ok
Tinh bang cach thuan tien :
1+5+9+13+...+29
Moi vien gach hoa hinh vuong deu co canh la 2 dm . Hay ve bieu thi cac cach xep 12 vien gach hinh voung do thanh hinh chu nhat va tinh chieu rong , chieu dai , chu vi cua hinh chu nhat do ( giai bang hai cach )
Ai lam dung minh tich cho
cac ban giai nhanh len nhe inh dang can gap
tinh bang cach than tien nhat : ( 567432 + 76543) :5=?
tinh bang cach thuan tien
125+156+875
789+987+211
ket ban luon nhe mk tk cho
