90-12.5-7.5 6.89-(0.27+0.89)4.78-1.28+1.22-0.729.9+99.9+999.9  ...
答案:1 悬赏:20 手机版
解决时间 2021-02-09 11:34
- 提问者网友:末路
- 2021-02-08 19:41
90-12.5-7.5 6.89-(0.27+0.89)4.78-1.28+1.22-0.729.9+99.9+999.9  ...
最佳答案
- 五星知识达人网友:逐風
- 2021-02-08 20:42
①90-12.5-7.5
=90-(12.5+7.5)
=90-20
=70;
②6.89-(0.27+0.89)
=6.89-0.89-0.27
=6-0.27
=5.73;
③4.78-1.28+1.22-0.72
=4.78+1.22-1.28-0.72
=(4.78+1.22)-(1.28+0.72)
=6-2
=4;
④9.9+99.9+999.9
=(10-0.1)+(100-0.1)+(1000-0.1)
=10+100+1000-0.1-0.1-0.1
=10+100+1000-(0.1+0.1+0.1)
=1110-0.3
=1109.7;
⑤6.02+4.3+5.18
=6.02+5.18+4.3
=12+4.3
=16.6;
⑥3.68+4.56-2.68
=3.68-2.68+4.56
=1+4.56
=5.56.
=90-(12.5+7.5)
=90-20
=70;
②6.89-(0.27+0.89)
=6.89-0.89-0.27
=6-0.27
=5.73;
③4.78-1.28+1.22-0.72
=4.78+1.22-1.28-0.72
=(4.78+1.22)-(1.28+0.72)
=6-2
=4;
④9.9+99.9+999.9
=(10-0.1)+(100-0.1)+(1000-0.1)
=10+100+1000-0.1-0.1-0.1
=10+100+1000-(0.1+0.1+0.1)
=1110-0.3
=1109.7;
⑤6.02+4.3+5.18
=6.02+5.18+4.3
=12+4.3
=16.6;
⑥3.68+4.56-2.68
=3.68-2.68+4.56
=1+4.56
=5.56.
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