问题
解答题
解方程.
(1)0.4(x+1.8)=2 (2)x-2.8+2.2=5.
答案
(1)0.4(x+1.8)=2,
0.4(x+1.8)÷0.4=2÷0.4,
x+1.8=5,
x+1.8-1.8=5-1.8,
x=3.2;
(2)x-2.8+2.2=5,
x-2.8+2.2-2.2=5-2.2,
x-2.8=2.8,
x-2.8+2.8=2.8+2.8,
x=5.6.
解方程.
(1)0.4(x+1.8)=2 (2)x-2.8+2.2=5.
(1)0.4(x+1.8)=2,
0.4(x+1.8)÷0.4=2÷0.4,
x+1.8=5,
x+1.8-1.8=5-1.8,
x=3.2;
(2)x-2.8+2.2=5,
x-2.8+2.2-2.2=5-2.2,
x-2.8=2.8,
x-2.8+2.8=2.8+2.8,
x=5.6.