若a=2,b=5,m=3,n=4时,分别求下列各式的值 (1)(a+m)·(b+n) (2)a(b+若a=2,b=5,m=3,n=4时,分别求下列各式的值(1)(a+m)·(b+n)(2)a(b+n)+m(b+n)(3)ab+an+bm+mn你发现什么?再找一组带入
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![若a=2,b=5,m=3,n=4时,分别求下列各式的值 (1)(a+m)·(b+n) (2)a(b+若a=2,b=5,m=3,n=4时,分别求下列各式的值(1)(a+m)·(b+n)(2)a(b+n)+m(b+n)(3)ab+an+bm+mn你发现什么?再找一组带入](/uploads/image/z/13577096-56-6.jpg?t=%E8%8B%A5a%3D2%2Cb%3D5%2Cm%3D3%2Cn%3D4%E6%97%B6%2C%E5%88%86%E5%88%AB%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC+%EF%BC%881%EF%BC%89%EF%BC%88a%2Bm%EF%BC%89%C2%B7%EF%BC%88b%2Bn%EF%BC%89+%EF%BC%882%EF%BC%89a%EF%BC%88b%2B%E8%8B%A5a%3D2%2Cb%3D5%2Cm%3D3%2Cn%3D4%E6%97%B6%2C%E5%88%86%E5%88%AB%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC%EF%BC%881%EF%BC%89%EF%BC%88a%2Bm%EF%BC%89%C2%B7%EF%BC%88b%2Bn%EF%BC%89%EF%BC%882%EF%BC%89a%EF%BC%88b%2Bn%EF%BC%89%2Bm%EF%BC%88b%2Bn%EF%BC%89%EF%BC%883%EF%BC%89ab%2Ban%2Bbm%2Bmn%E4%BD%A0%E5%8F%91%E7%8E%B0%E4%BB%80%E4%B9%88%3F%E5%86%8D%E6%89%BE%E4%B8%80%E7%BB%84%E5%B8%A6%E5%85%A5)
若a=2,b=5,m=3,n=4时,分别求下列各式的值 (1)(a+m)·(b+n) (2)a(b+若a=2,b=5,m=3,n=4时,分别求下列各式的值(1)(a+m)·(b+n)(2)a(b+n)+m(b+n)(3)ab+an+bm+mn你发现什么?再找一组带入
若a=2,b=5,m=3,n=4时,分别求下列各式的值 (1)(a+m)·(b+n) (2)a(b+
若a=2,b=5,m=3,n=4时,分别求下列各式的值
(1)(a+m)·(b+n)
(2)a(b+n)+m(b+n)
(3)ab+an+bm+mn
你发现什么?再找一组带入
若a=2,b=5,m=3,n=4时,分别求下列各式的值 (1)(a+m)·(b+n) (2)a(b+若a=2,b=5,m=3,n=4时,分别求下列各式的值(1)(a+m)·(b+n)(2)a(b+n)+m(b+n)(3)ab+an+bm+mn你发现什么?再找一组带入
若a=2,b=5,m=3,n=4时,分别求下列各式的值
(1)(a+m)·(b+n)
=(2+3)×(5+4)
=5×9
=45;
(2)a(b+n)+m(b+n)
=2×(5+4)+3×(5+4)
=18+27
=45;
(3)ab+an+bm+mn
=2×5+2×4+5×3+3×4
=10+8+15+12
=45;
你发现什么?
(a+m)(n+b)
=a(b+n)+m(b+n)
=ab+an+mb+mn;
再找一组带入
a=1;b=1;m=2;n=2;
(1)(a+m)·(b+n)
=(1+2)×(1+2)
=3×3
=9;
(2)a(b+n)+m(b+n)
=1×(1+2)+2×(1+2)
=3+6
=9;
(3)ab+an+bm+mn
=1×1+1×2+2×1+2×2
=1+2+2+4
=9;
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