Judge whether the following equation is a linear equation:
①-3x-6x2=7()
③5x+ 1-2x=3x-2()
④3y-4=2y+ 1。 ( )
Judge whether the solution of the following equation is correct:
① Solve equation 3y-4=y+3.
3y-y=3+4,2y=7,y=3.5
② Solving equation: 0.4x-3=0. 1x+2.
0.4x+0. 1x = 2-3; 0.5x=- 1,x=-2
③ Solving the equation
5x+ 15-2x-2= 10,3x=-3,x =- 1;
④ Solving the equation
2x-4+5-5x=- 1,-3x=-2,x=。 ( )
2) Fill in the blanks:
(1) If 2(3-a)x-4=5 is a linear equation about x, then a≦_
(2) The solution of equation ax=3 about X is a natural number, so the value of integer A is _
(3) The solution of equation 5x-2(x- 1)= 17 is _
(4) If x = 2 is the solution of equation 2x-3=m-, then m=_.
(5) If -2x2-5m+ 1=0 is a linear equation about x, then m=_.
(6) When y=_, the algebraic expressions 5y+6 and 3y-2 are reciprocal.
(7) When m=_, the solution of the equation is 0.
(8) If a≠0 is known, the solution of equation 3ab-(a+b)x=(a-b)x about x is _ _ _ _ _.
3) Multiple choice questions:
The solution of (1) equation ax=b is ().
A. there is a solution x = B. There are countless solutions
C. No solution D. When a≠0, x=
(2) Solve equation (x- 1)=3. Among the following variants, the simpler one is ().
A. multiply both sides of the equation by 4 to get 3( x- 1)= 12.
B. remove the brackets and get x- =3.
C. divide both sides by the same number to get x- 1=4.
D. finish, acquire
(3) Equation 2- Denominator ()
a . 2-2(2x-4)=-(x-7)b . 12-2(2x-4)=-x-7
C.12-2 (2x-4) =-(x-7) D. None of the above answers are correct.
(4) If the algebraic ratio is greater than 1, the value of x is ().
13 BC
(5)x= 1.5 is the solution of equation ().
A.4x+2=2x-(-2-9)
B.2{3[4(5x- 1)-8]-2}=8
C.4x+9 =6x+6
4) Answer the following questions:
When (1)x is equal to what number, are the values of algebraic expressions equal?
(2) When y is equal to what number, the value of the algebraic expression is 3 less than that of the algebraic expression?
(3) When m is equal to what number, the sum of the value of algebraic expression 2m- and the value of algebraic expression is equal to 5?
(4) Solve the following equation about x:
①ax+b = bx+a; (a≠b);
Three. Simplify and simplify the assessment
Cross-cultural assessment:
1 、-9(x-2)-y(x-5)
(1) simplifies the whole equation.
(2) When x=5, find the solution of y. 。
2、5(9+a)×b-5(5+b)×a
(1) simplifies the whole equation.
(2) When a=5/7, find the value of the formula.
3、62g+62(g+b)-b
(1) simplifies the whole equation.
(2) When g=5/7, find the solution of B. 。
4、3(x+y)-5(4+x)+2y
(1) simplifies the whole equation.
5 、( x+y)(x-y)
(1) simplifies the whole equation.
6、2ab+a×a-b
(1) simplifies the whole equation.
7、5.6x+4(x+y)-y
(1) simplifies the whole equation.
8、6.4(x+2.9)-y+2(x-y)
(1) simplifies the whole equation.
9 、( 2.5+x)(5.2+y)
(1) simplifies the whole equation.
10、9.77x-(5-a)x+2a
(1) simplifies the whole equation.
Substitute x =-2, y = 0. 1, a = 4 and b = 1 into the following formula for evaluation.
3(x+2)-2(x-3)
5(5+a)×b-5(5+b)×a
62a+62(a+b)-b
3(x+y)-5(4+x)+2y
(x+y)(x-y)
2ab+a×a-b
5.6x+4(x+y)-y
6.4(x+2.9)-y+2(x-y)
(2.5+x)(5.2+y)
9.77x-(5-a)x+2a