(关于有理数加减法:(﹢9)-(﹢21) (2)(﹣12)-(﹢18) (3)0-(﹣63) (4)(﹣32)-0 (5)(﹣5.4)-2.8还有:(6)(﹢37.9)-(﹣5.1) (7)(﹣15)-(8﹣9) (8)(8﹣2)-(14﹣9)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 16:12:21
![(关于有理数加减法:(﹢9)-(﹢21) (2)(﹣12)-(﹢18) (3)0-(﹣63) (4)(﹣32)-0 (5)(﹣5.4)-2.8还有:(6)(﹢37.9)-(﹣5.1) (7)(﹣15)-(8﹣9) (8)(8﹣2)-(14﹣9)](/uploads/image/z/2698113-57-3.jpg?t=%28%E5%85%B3%E4%BA%8E%E6%9C%89%E7%90%86%E6%95%B0%E5%8A%A0%E5%87%8F%E6%B3%95%EF%BC%9A%28%EF%B9%A29%29-%28%EF%B9%A221%29+%282%29%28%EF%B9%A312%29-%28%EF%B9%A218%29+%283%290-%28%EF%B9%A363%29+%284%29%28%EF%B9%A332%29-0+%285%29%28%EF%B9%A35.4%29-2.8%E8%BF%98%E6%9C%89%EF%BC%9A%286%29%28%EF%B9%A237.9%29-%28%EF%B9%A35.1%29+%287%29%28%EF%B9%A315%29-%288%EF%B9%A39%29+%288%29%288%EF%B9%A32%29-%2814%EF%B9%A39%29)
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(关于有理数加减法:(﹢9)-(﹢21) (2)(﹣12)-(﹢18) (3)0-(﹣63) (4)(﹣32)-0 (5)(﹣5.4)-2.8还有:(6)(﹢37.9)-(﹣5.1) (7)(﹣15)-(8﹣9) (8)(8﹣2)-(14﹣9)
(关于有理数加减法:(﹢9)-(﹢21) (2)(﹣12)-(﹢18) (3)0-(﹣63) (4)(﹣32)-0 (5)(﹣5.4)-2.8
还有:(6)(﹢37.9)-(﹣5.1) (7)(﹣15)-(8﹣9) (8)(8﹣2)-(14﹣9)
(关于有理数加减法:(﹢9)-(﹢21) (2)(﹣12)-(﹢18) (3)0-(﹣63) (4)(﹣32)-0 (5)(﹣5.4)-2.8还有:(6)(﹢37.9)-(﹣5.1) (7)(﹣15)-(8﹣9) (8)(8﹣2)-(14﹣9)
(1)(﹢9)-(﹢21) =9-21=12
(2)(﹣12)-(﹢18) =-12-18=-30
(3)0-(﹣63) =0+63=63
(4)(﹣32)-0 =-32-0=-32
(5)(﹣5.4)-2.8 =-5.4-2.8=8.2
(6)(﹢37.9)-(﹣5.1) =37.9+5.1=43
(7)(﹣15)-(8﹣9) =-15-8+9=-14
(8)(8﹣2)-(14﹣9)=8-2-14+9=1
很简单,记住负负得正,正负或负正得负.
你不会自己算哪?
结果依次为:-12 、 -30 、 63 、 -32 、 -8.2 、 43 、 -16 、 1。
(6)43 (7)-16 (8)1