Question

五年级数学解方程

1.53x-15x=76
2.8（x+5)=56
3. 6.8x-2x=4.2 4 . 2x/3=18
5 。 7x=8.19乘3 6 4.5x+45=90

7 2x+3.5乘2=18
8 x-2.6x3=1.09
用性质 2 做

如 x/3=2.1
解:x/3x3=2.1x3
x=6.3
这种方法
不要用算式

Answer 1

1. 53x-15x=76 --> x=76/(53-15)=2
2. 8(x+5)=56 --> x=56/8 - 5 =2
3. 6.8x-2x=4.2 --> x=4.2/4.2=1
4. 2x/3=18 --> x=27
5. 7x=8.19乘3 --> x=3.51
6. 4.5x+45=90 --> x=10
7. 2x+3.5乘2=18 --> x=11/2=5.5
8. x-2.6x3=1.09 --> x=8.89

Answer 2

.53x-15x=76
38x=76
38x÷38=76÷38
x=2

2.8（x+5)=56
8（x+5）÷8=56÷8
x+5=7
x+5-5=7-5
x=2

3. 6.8x-2x=4.2
4.8x=4.2
4.8x÷4.8=4.2÷4.8
x=0.875

4. 2x/3=18
2x/3×3=18×3
2x=54
2x÷2=54÷2
x=27

5. 7x=8.19乘3
7x=24.57
7x÷7=24.57÷7
x=3.51

6 4.5x+45=90
4.5x+45-45=90-45
4.5x=45
4.5x÷4.5=45÷4.5
x=10

7 2x+3.5乘2=18
2x+7=18
2x+7-7=18-7
2x=11
2x÷2=11÷2
x=5.5

8 x-2.6x3=1.09
x-7.8=1.09
x-7.8+7.8=1.09+7.8
x=8.89
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Answer 3

1.53x-15x=76
38x=76
38x÷38=76÷38
x=2

2.8（x+5)=56
8（x+5）÷8=56÷8
x+5=7
x+5-5=7-5
x=2

3. 6.8x-2x=4.2
4.8x=4.2
4.8x÷4.8=4.2÷4.8
x=0.875

4. 2x/3=18
2x/3×3=18×3
2x=54
2x÷2=54÷2
x=27

5. 7x=8.19乘3
7x=24.57
7x÷7=24.57÷7
x=3.51

6 4.5x+45=90
4.5x+45-45=90-45
4.5x=45
4.5x÷4.5=45÷4.5
x=10

7 2x+3.5乘2=18
2x+7=18
2x+7-7=18-7
2x=11
2x÷2=11÷2
x=5.5
1. 53x-15x=76 --> x=76/(53-15)=2
2. 8(x+5)=56 --> x=56/8 - 5 =2
3. 6.8x-2x=4.2 --> x=4.2/4.2=1
4. 2x/3=18 --> x=27
5. 7x=8.19乘3 --> x=3.51
6. 4.5x+45=90 --> x=10
7. 2x+3.5乘2=18 --> x=11/2=5.5
8. x-2.6x3=1.09 --> x=8.89

Answer 4

1. 53x-15x=76 --> x=76/(53-15)=2
2. 8(x+5)=56 --> x=56/8 - 5 =2
3. 6.8x-2x=4.2 --> x=4.2/4.2=1
4. 2x/3=18 --> x=27
5. 7x=8.19乘3 --> x=3.51
6. 4.5x+45=90 --> x=10
7. 2x+3.5乘2=18 --> x=11/2=5.5

Answer 5