Question

这些方程怎么解？

1.6+7x=19.8
8×（2x-2）=2
23.46÷3x=4.6
0.27×3-6x=0.51

Answer 1

1.6+7x=19.8
7x=19.8-1.6
7x=18.2
x=18.2÷7
x=2.6

8×(2x-2)=2
2x-2=2÷8=1/4
2x=1/4+2=9/4
x=9/4÷2
x=9/8

23.46÷3x=4.6
3x=23.46÷4.6=5.1
x=5.1÷3
x=1.7

0.27×3-6x=0.51
0.81-6x=0.51
6x=0.81-0.51=0.3
x=0.3÷6
x=0.05

Answer 2

1.6+7x=19.8
7x=19.8-1.6=18.2
x=18.2÷7
x=2.6

8×（2x-2）=2
2x-2=2÷8=0.25
2x=0.25+2=2.25
x=2.25÷2
x=1.125

23.46÷3x=4.6
3x=23.46÷4.6=5.1
x=5.1÷3
x=1.7

0.27×3-6x=0.51
6x=0.81-0.51=0.3
x=0.3÷6
x=0.05

Answer 3

1.6+7x=19.8
7x=19.8-1.6
7x=18.2
x=2.6

8×（2x-2）=2
16x-16-2=0
16x-18=0
16x=18
x=9/8

23.46÷3x=4.6
3x=23.46÷4.6
3x=5.1
x=1.7

0.27×3-6x=0.51
0.81-6x=0.51
6x=0.3
x=0.05

Answer 4

你好~
1.6+7x=19.8
7x=18.2
x=2.6

8×（2x-2）=2
16x-16=2
x=9/8

23.46÷3x=4.6
23.46=13.8x
x=1.7

0.27×3-6x=0.51
0.81-6x=0.51
6x=0.3
x=0.05

Answer 5

1.6+7x=19.8,得,x=2.6
8×（2x-2）=2,得,x=9/8
23.46÷3x=4.6得,x=1.7
0.27×3-6x=0.51.得,x=0.05

Answer 6

1.6+7x=19.8
7x=19.8-1.6
7x=18.2
x=18.2÷7
x=2.6

8×(2x-2)=2
2x-2=2÷8=1/4
2x=1/4+2=9/4
x=9/4÷2
x=9/8

23.46÷3x=4.6
3x=23.46÷4.6=5.1
x=5.1÷3
x=1.7

0.27×3-6x=0.51
0.81-6x=0.51
6x=0.81-0.51=0.3
x=0.3÷6
x=0.05