Các câu hỏi tương tự
tinh nhanh 1/4*3+1/4*5+1/6*5+1/7*6+1/8*7+1/9*8+1/10*9=
tinh nhanh
1/10 nhan 2/9 nhan 3/8 nhan 4/7 nhan 5/6 nhan 6/5 nhan 7/4 nhan 8/3 nhan 9/ 2
Tinh nhanh:
1/3*4+1/4*5+1/5*6+........+1/9*10+1/10*11
ghi them loi giai!!!!!!!
tinh nhanh
1+2-3-3+5+6-7-8+9+10
Tinh
a) 8/5 + 3/10
b)2/3 + 3/4 + 1/6
c)5/6 - 2/9
1+2+3+5+6+7+8+9+10= 1234567890 hoi tai sao lai phep tinh do =123467890
Dien < > =
A 2/3:5/6. 4/5×2/3
B 1/2×3/4. 5/8:6/8
C 9/7:3/2. 7/6:1/4
D 13/12:12/11. 11/10:10/9
CAC BAN NHO VIET KET QUA DUOI MOI PHAN SO MA MINH TINH DUOC NHE
1+2-3+4-5+6-7+8-9+10...19+20 tinh nhanh bang bao nhieu giai thich cach lam
bai 1; 2/5 + 1/2 + 7/10 ; 4/9 + 11/8 - 5/6 ; 9/20 - 8/15 * 5/12
bai 2 ; 2/5 + 3/10 - 1/2 ; 8/11 + 8/33 * 3/4
bai 3 ; x - 3/4 = 1/2 ;
bai 4 ; tinh chu vi hinh chu nhat co chieu dai 4/5 m va chieu rong 2/3 m