16.25=(16:4).(25.4)=4.100=400
16.25=(16:4).(25.4)=4.100=400
a) nhân thua so nay, chia thua so kia cho cung mot so
24.50 ; 16.25
nhan ca so bi chia va so chia cho cung mot so
2100:50 ; 1400:25
Tính nhẩm bang cach nhan thua so nay,chia thua so kia cho cung mot so: 15.16.125
1) tim so tu nhien x,biet
A)(x-35)-120=0
B)124+(118-x)=217
C)156-(x+61=82
2) tinh nham bang cach them vao o so nay.bớt di cua so hang kia cung mot so tjich hop
Vi du:57+96=(57-4)+(96+4)=53+100=153
Hay tinh nham 35+98
46+29
3)tinh nham bang cay them vao so tru va so bi tru cung mot so thich hop
Vi du:135-98=(135+2)-(98+2)=137-100=37Hay tinh nham 321-96
1354-997
a, nhan thua so nay ,chia thua so kia cho cung mot so 28.25
b, nhan ca so bi chia va so chi
Tinh nham bang them vao o so hang nay , bot di o so hang kia cung mot so don vi : 57 + 39
133
a.phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111
b.thay dau * boi chu so thich hop:
**.*=111
a, phan tich so 111 ra thua so nguyen to roi tim tap hop cac uoc cua 111.
b, thay dau * boi chu so thich hop:
** . * =111
phat bieu va viet dang hai luy thua cung co so chia 2 luy thua cung co so
biet abc phan tich ra thua so nguyen to co thua so 3,7. cm a+19b+4c cung co tinh chat do