若1=5,2=6,3=7,4=8则5
已知全集U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则(u(M∪N)=
{}+{}={}{}—{}={} {}*{}={} 1,2,3,4,5,6,7,8,9,0.
2=2=1×2 2+4=6=2×3 2+4+6=12=4×5 2+4+6+8=20=4×5 .
11、若已定义:int a[]={0,1,2,3,4,5,6,7,8,9},*p=a,i; 其中 0 ≤ i ≤ 9,则
设全集S={x∈N+|x≤8},若A∩(CsB)={2,8},(CsA)U(CsB)={1,2,3,4,5,6,7,8}
设全集U={1,2,3,4,5,6,7,8,9}若A交集B={3},A交集CuB={1,5,7},CuA交集CuB={9
3/8+13/18= 5/6+8/9= 2/7+1/3= 7/12-3/8=
求x的值 8分之3:x=百分之5:0.6 6分之1x:4分之3=7:1又5分之2
若2!=2×3!=3×4×5,=6×7×8×9×10×11,请计算4!/5!的值
找规律并证明5^2-3^2=8×2 9^2-7^2=8×4 15^2-3^6=8×27 11^2-5^2=8×12 15
根据下面一组等式:S 1 =1;S 2 =2+3=5;S 3 =4+5+6=15;S 4 =7+8+9+10=34;S
y*(6分之5+8分之5)=20分之7 3分之2y-4分之1y=6分之1 y-7分之2y=14分之1