7x-20=5401.3x-0.44=0.65x-3.2x=81x-0.1x=1.084.5x÷3=0.9(7-1.4)x+5=7.8.
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解决时间 2021-12-01 06:02
- 提问者网友:杀生予夺
- 2021-11-30 12:04
7x-20=5401.3x-0.44=0.65x-3.2x=81x-0.1x=1.084.5x÷3=0.9(7-1.4)x+5=7.8.
最佳答案
- 五星知识达人网友:十鸦
- 2020-10-12 08:11
解:7x-20=540,
?7x-20+20=540+20,
?????? 7x=560,
??? 7x÷7=560÷7,
????????x=80;
?????
?????1.3x-0.44=0.6,
1.3x-0.44+0.44=0.6+0.44,
????????? 1.3x=1.04,
??? ?1.3x÷1.3=1.04÷1.3,
???????????? x=0.8;
??5x-3.2x=81,
??? ?1.8x=81,
1.8x÷1.8=81÷1.8,
??????? x=45;
? ?x-0.1x=1.08,
??? ?0.9x=1.08,
0.9x÷0.9=1.08÷0.9,
??????? x=1.2;
?? 4.5x÷3=0.9,
4.5x÷3×3=0.9×3,
???? ?4.5x=2.7,
?4.5x÷4.5=2.7÷4.5,
??????? ?x=0.6;
(7-1.4)x+5=7.8,
????? 5.6x+5=7.8,
??? 5.6x+5-5=7.8-5,
?????? ?5.6x=2.8,
? ?5.6x÷5.6=2.8÷5.6,
?????????? x=0.5.解析分析:利用等式的性质,两边同时加上或减去一个数或同时乘或除一个不为0的数,把方程转化为x=a的形式即可.点评:解方程主要考查等式的性质的灵活运用.
?7x-20+20=540+20,
?????? 7x=560,
??? 7x÷7=560÷7,
????????x=80;
?????
?????1.3x-0.44=0.6,
1.3x-0.44+0.44=0.6+0.44,
????????? 1.3x=1.04,
??? ?1.3x÷1.3=1.04÷1.3,
???????????? x=0.8;
??5x-3.2x=81,
??? ?1.8x=81,
1.8x÷1.8=81÷1.8,
??????? x=45;
? ?x-0.1x=1.08,
??? ?0.9x=1.08,
0.9x÷0.9=1.08÷0.9,
??????? x=1.2;
?? 4.5x÷3=0.9,
4.5x÷3×3=0.9×3,
???? ?4.5x=2.7,
?4.5x÷4.5=2.7÷4.5,
??????? ?x=0.6;
(7-1.4)x+5=7.8,
????? 5.6x+5=7.8,
??? 5.6x+5-5=7.8-5,
?????? ?5.6x=2.8,
? ?5.6x÷5.6=2.8÷5.6,
?????????? x=0.5.解析分析:利用等式的性质,两边同时加上或减去一个数或同时乘或除一个不为0的数,把方程转化为x=a的形式即可.点评:解方程主要考查等式的性质的灵活运用.
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- 1楼网友:荒野風
- 2018-12-31 08:48
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