1又1/3+7/12-9/20+11/30-13/42=多少?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/29 22:44:29
![1又1/3+7/12-9/20+11/30-13/42=多少?](/uploads/image/z/37350-54-0.jpg?t=1%E5%8F%881%2F3%2B7%2F12-9%2F20%2B11%2F30-13%2F42%3D%E5%A4%9A%E5%B0%91%3F)
1又1/3+7/12-9/20+11/30-13/42=多少?
1又1/3+7/12-9/20+11/30-13/42=多少?
1又1/3+7/12-9/20+11/30-13/42=多少?
=4/3+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)
=4/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7
=5/3-1/7
=32/21
=1又21分11
32/21
1又1/3+7/12-9/20+11/30-13/42
=1+1/3+1/3+1/4-(1/4+1/5)+(1/5+1/6)-(1/6-1/7)
=1+1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7
=1+2/3-1/7
=1+11/21
=32/21
1又1/3+7/12-9/20+11/30-13/42
=1+1/3+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)
=1+1/3+1/3-1/7
=5/3-1/7
=35/21-3/21
=32/21
=32/21 即 1又11/21.