七年级 有理数加减乘除混合运算 要过程和答案⑴(7/12 - 1又1/2 - 1/4)÷(-1/12)÷(-2又1/3) ⑵31又1/3 × 41又1/2 -11又1/3 ×
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![七年级 有理数加减乘除混合运算 要过程和答案⑴(7/12 - 1又1/2 - 1/4)÷(-1/12)÷(-2又1/3) ⑵31又1/3 × 41又1/2 -11又1/3 ×](/uploads/image/z/8701822-46-2.jpg?t=%E4%B8%83%E5%B9%B4%E7%BA%A7+%E6%9C%89%E7%90%86%E6%95%B0%E5%8A%A0%E5%87%8F%E4%B9%98%E9%99%A4%E6%B7%B7%E5%90%88%E8%BF%90%E7%AE%97+%E8%A6%81%E8%BF%87%E7%A8%8B%E5%92%8C%E7%AD%94%E6%A1%88%E2%91%B4%EF%BC%887%2F12+%EF%BC%8D+1%E5%8F%881%2F2+%EF%BC%8D+1%2F4%EF%BC%89%C3%B7%EF%BC%88-1%2F12%EF%BC%89%C3%B7%EF%BC%88-2%E5%8F%881%2F3%EF%BC%89++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%E2%91%B531%E5%8F%881%2F3+%C3%97+41%E5%8F%881%2F2+%EF%BC%8D11%E5%8F%881%2F3+%C3%97)
七年级 有理数加减乘除混合运算 要过程和答案⑴(7/12 - 1又1/2 - 1/4)÷(-1/12)÷(-2又1/3) ⑵31又1/3 × 41又1/2 -11又1/3 ×
七年级 有理数加减乘除混合运算 要过程和答案
⑴(7/12 - 1又1/2 - 1/4)÷(-1/12)÷(-2又1/3) ⑵31又1/3 × 41又1/2 -11又1/3 × 41又1/2 × 2 - 9.5 × 11又1/3
七年级 有理数加减乘除混合运算 要过程和答案⑴(7/12 - 1又1/2 - 1/4)÷(-1/12)÷(-2又1/3) ⑵31又1/3 × 41又1/2 -11又1/3 ×
⑴
(7/12 - 1又1/2 - 1/4)÷(-1/12)÷(-2又1/3) =(7/12-18/12-3/12)×( -12)× (-3/7)=-14/12×( -12)× (-3/7)=14×(-3/7)=-6
⑵31又1/3 × 41又1/2 -11又1/3 × 41又1/2 × 2 - 9.5 × 11又1/3=41又1/2 ×(31又1/3 -11又1/3 × 2 )- 9.5 × 11又1/3=83/2×(94/3-68/3)-19/2×34/3=83/2×26/3-19/2×34/3=(83×26-19×34)/6=1512/6=252