问题
解答题
解方程:
x:1.2=3:4
3.2x-4×3=52
0.4x+2x=16.8.
答案
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;
(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x÷3.2=64÷3.2,
x=20;
(3)0.4x+2x=16.8,
2.4x=16.8,
2.4x÷2.4=16.8÷2.4,
x=7.
解方程:
x:1.2=3:4
3.2x-4×3=52
0.4x+2x=16.8.
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9;
(2)3.2x-4×3=52,
3.2x-12+12=52+12,
3.2x÷3.2=64÷3.2,
x=20;
(3)0.4x+2x=16.8,
2.4x=16.8,
2.4x÷2.4=16.8÷2.4,
x=7.