Trả lời câu hỏi 3 Bài 4 trang 14 SGK Toán 7 Tập 1

Tính:\(\eqalign{
& a)\,\, - 3,116 + 0,263 \cr
& b)\,\,\left( { - 3,7} \right).\left( { - 2,16} \right) \cr} \)

Lời giải

\(\eqalign{
& a)\,\, - 3,116 + 0,263 \cr
& = - \left( {3,116 - 0,263} \right) \cr
& = - 2,853 \cr
& b)\,\,\left( { - 3,7} \right).\left( { - 2,16} \right) \cr
& = 3,7.2,16 = 7,992 \cr} \)


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