(x+y)(a+b)+(x+y)(2a+2b)怎么算?
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(x+y)(a+b)+(x+y)(2a+2b)
=(x+y)(a+b) +(x+y)(a+b)×2
=(x+y)(a+b) + 2(x+y)(a+b)
=(x+y)(a+b) (1+2)
=3(x+y)(a+b)
=3xa+3xb+3ya+3yb
=(x+y)(a+b) +(x+y)(a+b)×2
=(x+y)(a+b) + 2(x+y)(a+b)
=(x+y)(a+b) (1+2)
=3(x+y)(a+b)
=3xa+3xb+3ya+3yb
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展开全部
原式=(x+y)(a+b)+(x+y)·2(a+b)
=(x+y)(a+b)+2(x+y)(a+b)
=3(x+y)(a+b)
=3(xa+xb+ya+yb)
=3xa+3xb+3ya+3yb
=(x+y)(a+b)+2(x+y)(a+b)
=3(x+y)(a+b)
=3(xa+xb+ya+yb)
=3xa+3xb+3ya+3yb
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