问题
解答题
解方程
428+x=731
(1-60%)x=28
4x+1.5×4=56.
答案
(1)428+x=731,
428+x-428=731-428,
x=303;
(2)(1-60%)x=28,
0.4x=28,
0.4x÷0.4=28÷0.4,
x=70;
(3)4x+1.5×4=56,
4x+6=56,
4x+6-6=56-6,
4x=50,
4x÷4=50÷4,
x=12.5.
解方程
428+x=731
(1-60%)x=28
4x+1.5×4=56.
(1)428+x=731,
428+x-428=731-428,
x=303;
(2)(1-60%)x=28,
0.4x=28,
0.4x÷0.4=28÷0.4,
x=70;
(3)4x+1.5×4=56,
4x+6=56,
4x+6-6=56-6,
4x=50,
4x÷4=50÷4,
x=12.5.