五年级数学解方程的练习题(2)

咏良 1172分享
习题二

  (21)3x-9=30

  3x=9+30

  x=39÷3

  x=13

  (22)6x+6=12

  6x=6+12

  x=18÷6

  x=3

  (23)3x-3=12

  3x=3+12

  x=15÷3

  x=5

  (24)5x-3x=4

  2x=4

  x=4÷2

  x=2

  (25)2x+16=19

  2x=19-16

  x=3÷2

  x=1.5

  (26)5x+8=19

  5x=19-8

  x=11÷5

  x=2.2

  (27)14-6x=8

  6x=14-8

  6x=6

  x=6÷6

  x=1

  (28)15+6x=27

  6x=27-15

  x=12÷6

  x=2

  (29)5-8x=4

  8x=5-4

  x=1÷8

  x=0.125

  (30)7x+8=15

  7x=15-8

  x=7÷7

  x=1

  (31)9-2x=1

  2x=9-1

  x=8÷2

  x=4

  (32)4+5x=9

  5x=9-4

  x=5÷5

  x=1

  (33)10-x=8

  x=10-8

  x=2

  (34)8x+9=17

  8x=17-9

  x=8÷8

  x=1

  (35)9+6x=27

  6x=27-9

  x=18÷6

  x=3

  (36)x+9x=4+7

  10x=11

  x=11÷10.

  x=1.1

  (37)2x+9=17

  2x=17-9

  x=8÷2

  x=4

  (38)8-4x=6

  4x=8-6

  x=4÷4

  x=1

  (39)6x-7=11

  6x=7+11

  x=18÷6

  x=3

  (40)5x-9=8

  5x=9+8

  x=17÷5

  x=3.4

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