3*2+8/4
Tính:
7 +1 = 6 + 2 = 5 + 3 = 4 + 4 =
1 + 7 = 2 + 6 = 3 + 5 = 8 - 4 =
8 - 7 = 8 - 6 = 8 - 5 = 8 + 0 =
8 - 1 = 8 - 2 = 8 - 3 = 8 - 0 =
7 +1 = 8 6 + 2 = 8 5 + 3 = 8 4 + 4 = 8
1 + 7 = 8 2 + 6 = 8 3 + 5 = 8 8 - 4 = 4
8 - 7 = 1 8 - 6 = 2 8 - 5 = 3 8 + 0 = 8
8 - 1 = 7 8 - 2 = 6 8 - 3 = 5 8 - 0 = 8
8 8 8 8 cô ko dạy hả em mà em ko biết
8 8 8 4
1 2 3 8
7 6 5 8
Tính
b)
4 + 5 - 7 = 6 - 4 + 8 = 10 - 9 + 6 = 9 - 4 - 3 =
1 + 2 + 6 = 3 + 2 + 4 = 8 - 2 + 4 = 8 - 4 + 3 =
3 - 2 + 9 = 7 - 5 + 3 = 3 + 5 - 6 = 2 + 5 - 4 =
b) Tính theo thứ tự từ trái sang phải.
4 + 5 - 7 = 2 6 - 4 + 8 = 10 10 - 9 + 6 = 7 9 - 4 - 3 = 2
1 + 2 + 6 = 9 3 + 2 + 4 = 9 8 - 2 + 4 = 10 8 - 4 + 3 = 7
3 - 2 + 9 = 10 7 - 5 + 3 = 5 3 + 5 - 6 = 2 2 + 5 - 4 = 3
Tính:
4 + 3 + 1 = 8 - 4 - 2 = 2 + 6 - 5 = 8 + 0 - 5 =
5 + 1 + 2 = 8 - 6 + 3 = 7 - 3 + 4 = 3 + 3 - 4 =
4 + 3 + 1 = 8; 8 - 4 - 2 = 2;
5 + 1 + 2 = 8; 8 - 6 + 3 = 5;
2 + 6 - 5 = 3; 8 + 0 - 5 = 3
7 - 3 + 4 = 8; 3 + 3 - 4 = 2
Tính:
8 – 4 – 2 = … | 4 + 3 + 1 = … | 2 + 6 – 5 = … | 8 + 0 – 5 = … |
8 – 6 + 3 = … | 5 + 1 + 2 = … | 7 – 3 + 4 = … | 3 + 3 – 4 = … |
Lời giải chi tiết:
8 – 4 – 2 = 2 | 4 + 3 + 1 = 8 | 2 + 6 – 5 = 3 | 8 + 0 – 5 = 3 |
8 – 6 + 3 = 5 | 5 + 1 + 2 = 8 | 7 – 3 + 4 = 8 | 3 + 3 – 4 = 2 |
1) 1 3/4-1 3/8:(3/8+9/20
2) 4 7/8-3 11/12:( 5/6+1 1/8)
3) 8 2/3:(6 2/3-4 1/2)-2 37/51
MÀ KHOAN ULTR
1) 1 3/4-1 3/8:(3/8+9/20)
2) 4 7/8-3 11/12:( 5/6+1 1/8)
3) 8 2/3 : ( 6 2/3-4 1/2)-2 37/51
1)\(1\frac{3}{4}-1\frac{3}{8}:\left(\frac{3}{8}+\frac{9}{20}\right)=\frac{7}{4}-\frac{11}{8}:\frac{33}{40}=\frac{7}{4}-\frac{5}{3}=\frac{1}{12}\)
2) 4 và 7/8 -3 và 11/12:(5/6 + 1 và 1/8)=39/8-47/12:(5/6+9/8)=39/8-47/12:47/24=39/8-2=23/8
1*2*3*4...*9-1*2*3*4*...8-1*2*3*4*...*8*8
1*2*3*...*9-1*2*3*...*8-1*2*3*...8*8=9!-8!-8!*8
=8!*9-8!*1-8!*8
=8!*(9-1)-8!*8
=8!*8-8!*8
=0
tính nhanh hộ mình 2 câu này với :
1*2+2*4+3*6+4*8+5*10 / 3*4+6*8+9*12+12*16+15*20
2*4+2*4*8+4*8*16+8*16*32 / 3*4+2*6*8+4*12*168*24*32
a)
\(\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)
\(\frac{2.3\left(1.2\right)+2.3\left(2.4\right)+2.3\left(3.6\right)+2.3\left(4.8\right)+2.3\left(5.10\right)}{3.4\left(3.4+6.8+9.12+12.16+15.20\right)}\)
\(=\frac{\left(3.4+6.8+9.12+12.16+15.20\right)}{2.3\left(3.4+6.8+9.12+12.16+15.20\right)}=\frac{1}{2.3}=\frac{1}{6}\)
Tính
[(5*4^6*9^4-3^9*(-8)^4]/[4*2^13*3^8+2*8^4*(-27)^3]
\(\dfrac{5\cdot4^6\cdot9^4-3^9\cdot\left(-8\right)^4}{4\cdot2^{13}\cdot3^8+2\cdot8^4\cdot\left(-27\right)^3}\)
\(=\dfrac{5\cdot2^{12}\cdot3^8-3^9\cdot2^{12}}{2^{15}\cdot3^8-2^{13}\cdot3^9}\)
\(=\dfrac{2^{12}\cdot3^8\cdot\left(5-3\right)}{2^{13}\cdot3^8\left(2^2-3\right)}=\dfrac{1}{2}\cdot\dfrac{2}{1}=1\)