Bài 35 trang 13 SBT toán 7 tập 1

Tính:\(12345,4321.2468,91011 \)\(\,+ 12345,4321.(-2468,91011)\)

Lời giải

\(12345,4321.2468,91011 \)\(\,+ 12345,4321.(-2468,91011)\)

\(= 12345,4321.[2468,91011+( -  2468,91011)]\)

\(= 12345,4321.0= 0\).


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