①10.64÷2.8+7.54÷0.26 ②0.2608÷0.16+4÷1.25 ...
答案:1 悬赏:60 手机版
解决时间 2021-11-11 02:42
- 提问者网友:抽煙菂渘情少年
- 2021-11-10 12:40
①10.64÷2.8+7.54÷0.26 ②0.2608÷0.16+4÷1.25 ...
最佳答案
- 五星知识达人网友:不甚了了
- 2021-11-10 13:53
①10.64÷2.8+7.54÷0.26
=3.8+29
=32.8;
②0.2608÷0.16+4÷1.25
=1.63+3.2
=4.83;
③39.05÷7.1×4.2+5.58
=23.1+5.58
=28.68;
④15-(8-2)
=15-6
=9;
⑤4-3+5
=1+5
=6;
⑥11+7-9
=18-9
=9;
⑦5X+2=7X-8
解:5x+2-5x=7x-5x-8
2=2x-8
2x-8=2
2x-8+8=2+8
2x=10
2x÷2=10÷2
x=5;
⑧2X+20=4X-24
解:2X+20-2x=4X-2x-24
20=2x-24
2x-24=20
2x-24+24=20+24
2x=44
2x÷2=44÷2
x=22;
⑨6(X-1)=7(X-3)
解:6x-6=7x-21
6x-6+6=7x-21+6
6x=7x-15
6x-6x=7x-6x-15
0=x-15
x-15=0
x-15+15=0+15
x=15.
=3.8+29
=32.8;
②0.2608÷0.16+4÷1.25
=1.63+3.2
=4.83;
③39.05÷7.1×4.2+5.58
=23.1+5.58
=28.68;
④15-(8-2)
=15-6
=9;
⑤4-3+5
=1+5
=6;
⑥11+7-9
=18-9
=9;
⑦5X+2=7X-8
解:5x+2-5x=7x-5x-8
2=2x-8
2x-8=2
2x-8+8=2+8
2x=10
2x÷2=10÷2
x=5;
⑧2X+20=4X-24
解:2X+20-2x=4X-2x-24
20=2x-24
2x-24=20
2x-24+24=20+24
2x=44
2x÷2=44÷2
x=22;
⑨6(X-1)=7(X-3)
解:6x-6=7x-21
6x-6+6=7x-21+6
6x=7x-15
6x-6x=7x-6x-15
0=x-15
x-15=0
x-15+15=0+15
x=15.
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