(4.5+1.8)+2.2=( 4.5 )+(1.8+2.2),运用了加法( )律.
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![(4.5+1.8)+2.2=( 4.5 )+(1.8+2.2),运用了加法( )律.](/uploads/image/z/466950-30-0.jpg?t=%EF%BC%884.5%2B1.8%EF%BC%89%2B2.2%3D%28+4%EF%BC%8E5+%EF%BC%89%EF%BC%8B%EF%BC%881%EF%BC%8E8%EF%BC%8B2%EF%BC%8E2%EF%BC%89%2C%E8%BF%90%E7%94%A8%E4%BA%86%E5%8A%A0%E6%B3%95%EF%BC%88+%EF%BC%89%E5%BE%8B.)
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(4.5+1.8)+2.2=( 4.5 )+(1.8+2.2),运用了加法( )律.
(4.5+1.8)+2.2=( 4.5 )+(1.8+2.2),运用了加法( )律.
(4.5+1.8)+2.2=( 4.5 )+(1.8+2.2),运用了加法( )律.
加法结合