1. Equation: 9-x = 3,80 ÷ 4 = 20,7y = 63,20+30 = 50, y+17y=63 38,54 ÷ x = 9;
Equation: 9-x=3, 7y=63, y+ 17=38, 54÷x=9.
2.30+x = 80; 4x = 80;
3.52+x = 1 10;
4.x+ 10=50,3 x=20+70 .
1.-20; +54,+54。
2. Solution: x=70+35
x= 105
Solution: x=84-48
x=36
Solution: x=50+50
x= 100
Solution: x= 100-27
x=73
Solution: x=70+20
x = 90°
Solution: x=9-3
x=6
3.x +20= 100
Solution: x= 100-20
x =80
4.2; 5。
1. Subtract 36 from both sides of the equal sign.
x =64-36
x=28
Add 0.8 to both sides of the equal sign.
x = 1.9+0.8
x=2.7
2. Solution: x=490-240
x=250
Solution: x=5.5-0.7
x=4.8
Solution: x=95-69
x=26
Solution: x=47+47
x=94
Solution: x= 12-9.6
x=2.4
Solution: x= 1.4+0.78
x=2. 18
3.( 1)x=32,(2) x=20,(3) x=3
4.x+20= 100+ 10
Solution: x= 100+ 10-20.
x = 90°
5.5+x= 10
Solution: x= 10-5.5
x=4.5
1.×,√,×,√;
2.( 1) solution: x=6.3-3.8
x=2.5
(2) solution: x=7.2-4.8
x=2.4
(3) solution: x=4+ 1.8
x=5.8
(4) solution: x=7.9+2.6
x= 10.5
(5) solution: x=6.5+3.2
x=9.7
(6) solution: x=2.3-0.46
x= 1.84
3.( 1)x +36=45
Solution: x=45-36
x=9
(2)x -2=98 (or x -98=2)
Solution: x=98+2
x= 100
(3) x -45= 128
Solution: x= 128+45