(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)···(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)和(+3/1/3)X(-0.3)X(-11/1/4)X(-1/1/3);还有(-5/7/8)X(-21)-21X(-4/1/8)可不可以简便?如果可以,麻烦列出是怎么简便的..
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 02:05:05
![(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)···(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)和(+3/1/3)X(-0.3)X(-11/1/4)X(-1/1/3);还有(-5/7/8)X(-21)-21X(-4/1/8)可不可以简便?如果可以,麻烦列出是怎么简便的..](/uploads/image/z/13601448-0-8.jpg?t=%EF%BC%88-1.23%EF%BC%89X%28%2B1%2F1%2F3%29X%28-2.5%29X%28-1%2F1%2F41%29%C2%B7%C2%B7%C2%B7%EF%BC%88-1.23%EF%BC%89X%28%2B1%2F1%2F3%29X%28-2.5%29X%28-1%2F1%2F41%29%E5%92%8C%EF%BC%88%2B3%2F1%2F3%29X%28-0.3%29X%28-11%2F1%2F4%29X%28-1%2F1%2F3%29%3B%E8%BF%98%E6%9C%89%28-5%2F7%2F8%29X%28-21%29%EF%BC%8D21X%28-4%2F1%2F8%29%E5%8F%AF%E4%B8%8D%E5%8F%AF%E4%BB%A5%E7%AE%80%E4%BE%BF%3F%E5%A6%82%E6%9E%9C%E5%8F%AF%E4%BB%A5%2C%E9%BA%BB%E7%83%A6%E5%88%97%E5%87%BA%E6%98%AF%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%E7%9A%84..)
(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)···(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)和(+3/1/3)X(-0.3)X(-11/1/4)X(-1/1/3);还有(-5/7/8)X(-21)-21X(-4/1/8)可不可以简便?如果可以,麻烦列出是怎么简便的..
(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)···
(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)和(+3/1/3)X(-0.3)X(-11/1/4)X(-1/1/3);还有(-5/7/8)X(-21)-21X(-4/1/8)可不可以简便?如果可以,麻烦列出是怎么简便的..
(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)···(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)和(+3/1/3)X(-0.3)X(-11/1/4)X(-1/1/3);还有(-5/7/8)X(-21)-21X(-4/1/8)可不可以简便?如果可以,麻烦列出是怎么简便的..
(-1.23)X(+1/1/3)X(-2.5)X(-1/1/41)
=1.23X(4/3)X2.5X(-42/41)
=-(1.23/3)X(4X2.5)X(42/41)
=-0.41X10X(42/41)
=-4.1X(4.2/4.1)
=-4.2
(+3/1/3)X(-0.3)X(-11/1/4)X(-1/1/3)
=-(10/3)X0.3X(45/4)X(4/3)
=-(10/3X0.3)X(45/3)X(4/4)
=-1X15X1
=-15
(-5/7/8)X(-21)-21X(-4/1/8)
=(47/8)X21+21X(33/8)
=21X(47/8+33/8)
=21X(80/8)
=21X10
=210
可以简便,先化为分数,再计算,分子分母有相同的项可以消去