(关于有理数加减法:(﹢9)-(﹢21) (2)(﹣12)-(﹢18) (3)0-(﹣63) (4)(﹣32)-0 (5)(﹣5.4)-2.8
(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)
还有:(6)(﹢37.9)-(﹣5.1) (7)(﹣15)-(8﹣9) (8)(8﹣2)-(14﹣9)
数学人气:413 ℃时间:2020-04-16 05:01:01
优质解答
(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)...
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