解方程,五年级寒假作业苏教数学。

2x+0.4x=48 (2 + 0.4)x = 48 2.4x = 48 x = 20 带回原式得2*20 + 0.4*20 = 48 答案正确

8x-x=14.7 (8 - 1)x = 14.7 7x = 14.7 x = 2.1

35x+13x=9.6 (35 + 13) = 9.6 48x = 9.6 x = 0.2

5(x+3)=35 5x +5*3 = 35 5x = 35 - 5*3 5x = 0 x = 0

x+3.7x+2=16.1 (1 + 3.7)x + 2 = 16.1 4.7x = 16.1 - 2 4.7x = 14.1 x = 3

14x+3x-12x=158 (14 + 3 - 12)x = 158 5x = 158 x = 31.6

18-2.5x=13 -2.5x = 13 -18 -2.5x = -5 x = 2 带回原式得18 - 2.5*2 = 18 - 5 = 13答案正确

9.5x-5x=27 (9.5 - 5)x = 27 4.5x = 27 x = 6

1.5x-6=3 1.5x = 3 -(-6) 1.5x = 3 + 6 1.5x = 9 x = 6 带回原式得1.5*6 - 6 =9 - 6 = 3 答案正确

7x-0.6x=16 (7 - 0.6)x = 16 6.4x = 16 x = 2.5