问题
解答题
解方程
(1)X÷0.05=3.528
(2)11.5X+X=20
(3)5.5X-1.3X=12.6
(4)3×4+4X=28.
答案
(1)x÷0.05=3.528,
x÷0.05×0.05=3.528×0.05,
x=0.1764;
(2)11.5x+x=20,
12.5x=20,
12.5x÷12.5=20÷12.5,
x=1.6;
(3)5.5x-1.3x=12.6,
4.2x=12.6,
4.2x÷4.2=12.6÷4.2,
x=3;
(4)3×4+4x=28,
12+4x-12=28-12,
4x÷4=16÷4,
x=4.