3数の加法-1(6問)
次の計算をせよ。
(+1)+(+4)+(+5)
解答○ ×(-2)+(-1)+(-3)
解答○ ×(-5)+(+4)+(-2)
解答○ ×(+6)+(-5)+(+3)
解答○ ×(-2)+(-7)+(+8)
解答○ ×(+4)+(+3)+(-9)
解答○ ×問題と解答
(+1)+(+4)+(+5)10 (-2)+(-1)+(-3)-6 (-5)+(+4)+(-2)-3 (+6)+(-5)+(+3)4 (-2)+(-7)+(+8)-1 (+4)+(+3)+(-9)-2
