3/5+7/20 2/3-3/8 345*207 21 105:67
ai nhanh va du thi minh tik cho
4+9+8+6+2+1+3+7=
tinh nhanh va thuan tien
ai nhanh va day du nhat thi minh tk cho
4+9+8+6+2+1+3+7 = (4+6) + ( 9+1) + ( 8+2 ) + (7+3)
= 10 + 10 + 10 +10
= 40
4 + 9 + 8 + 6 + 2 + 1 + 3 + 7 = ( 4 + 6 ) + ( 9 + 1 ) + ( 8 + 2 ) + ( 3 + 7 )
= 10 + 10 + 10 + 10
= 10 x 4
= 40
= (4+6) +(9+1)+(8+2)+(3+7)
=10+10+10+10
=10x4
=40
k nhé
tinh nhanh
125*20*8*25*5
ai nhanh va dung thi minh tik cho
125*20*8*25*5
= ( 125*8 ) * ( 20*5 ) * 25
= 1000 * 100 * 25
= 100000 * 25
= 2500000
a) 7/-25+8/25 ; 4/5+4/-18 ; 7/21+9/-36
b) 12/20-2/5 ; 2/3-(-5/6) ; 6-3/20
c)2/21*(-7/3) ; 27/28*(-21) ; -15/7*(-14/25)
ai nhanh mk tk cho giup k nhe minh can gap
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 =.......
ai lam nhanh thi minh se tich va ket ban
A, tim a va b biet rang a.b=320 va BCNN(a,b)=160
B, tim so tu nhien a nho nhat co 3 chu so sao cho khi chia a cho 11 du 5 va chia cho 13 thi du 8
ai lam nhanh va chinh xac minh se like cho nha
Ai la nhanh minh tik cho nha
C = 5 va 9/10 ÷ 3/2-(2va1/3×4va1/2-2×2va 1/3) ÷ 7/4
"Va" la hon so nha cac ban
Tim 1 so . Biet neu chia so do cho 7 thi du 4 . Neu chia cho 9 thi du 8 va so thuong giam di 2 don vi. Ai tinh nhanh minh tick cho
chung to 7^6 +7^5-7^4 chia het cho 11
tim cac so tu nhien a biet khi chia a cho 3 thi duoc thuong la 18
MINH DANG CAN GAP
AI NHANH VA DUNG CA HAI MINH TIK CHO
7^6+7^5-7^4
=7^4(7^2+7-1)
=7^4.55 chia hết cho 11
Vậy...
chung to 7^6 +7^5-7^4 chia het cho 11
tim cac so tu nhien a biet khi chia a cho 3 thi duoc thuong la 18
MINH DANG CAN GAP
AI NHANH VA DUNG CA HAI MINH TIK CHO
\(7^6+7^5-7^4\)
\(=7^6+\left(7^5-7^4\right)\)
\(=7^6+\left[7\left(7^4\right)-7^4\right]\)
\(=7^6+\left(6\cdot7^4\right)\)
\(=7^4\cdot7^2+7^4\cdot6\)
\(=7^4\cdot\left(49+6\right)=7^4\cdot55\)
\(\Rightarrow7^4\cdot55⋮11\)