1化简下列各式.(8 13:36:9)（1）7a+4a-a(2)27x-9x+0.5x 1(3)15t-3n+5.5n-2 T
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1化简下列各式.(813:36:9)（1）7a+4a-a(2)27x-9x+0.5x 1(3)15t-3n+5.5n-2
1化简下列各式.(8 13:36:9)（1）7a+4a-a(2)27x-9x+0.5x 1(3)15t-3n+5.5n-2 T
1化简下列各式.(8 13:36:9)
（1）7a+4a-a
(2)27x-9x+0.5x 1
(3)15t-3n+5.5n-2 T
7
1化简下列各式.(8 13:36:9)（1）7a+4a-a(2)27x-9x+0.5x 1(3)15t-3n+5.5n-2 T
(1)7a+4a-a
=(7+4-1)a
=10a
(2)27x-9x+0.5x 1
=(27-9+0.5)x
=18.5x
(3)15t-3n+5.5n-2
=15t+(5.5-3)n-2
=15t+2.5n-2
[1] 10a
[2] 18.5x
[3] 15t+2.5n-2
(1)10a
(2)18.5x
(3)15t+2.5n-2
(1)7a+4a-a
=(7+4-1)*a
=10a
(2)27x-9x+0.5x
=(27-9+0.5)x
=18.5x
(3)15t-3n+5.5n-2
=15t+(3n-5.5n)-2
=15t-1.5n-2
我的答案是和1楼的回答者一样的：
1)7a+4a-a
=(7+4-1)a
=10a
(2)27x-9x+0.5x 1
=(27-9+0.5)x
=18.5x
(3)15t-3n+5.5n-2
=15t+(5.5-3)n-2
=15t+2.5n-2