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Mathematical calculation problems in the second volume of the seventh grade
( 1)7(2x- 1)-3(4x- 1)= 4(3x+2)- 1; (2)(5y+ 1)+( 1-y)=(9y+ 1)+( 1-3y); (3)[( 1/4x-3)-4]= x+2; (4)20%+( 1-20%)(320-x)= 320×40%(5)2(x-2)+2 = x+ 1(6)2(x-2)-3(4x- 1-x)= 9( 1-x)(7) 1 1x+64-2x = 100-9x(8)

; (22)(x+ 1)-3(x- 1)= 1-3x; (23)(x-2)-2(4x- 1)= 3( 1-x)。 (24) (25) ; (26) ; (27) ; (28) ; 1. 12(2x-3)= 4x+4 ^ 2。 (2x+ 14)=4- 15x 3。 = 4.+ =3+2y

5. 1 6.- 1 7.6.5= 7.5

1.2.3.

4.5.6.