问题 解答题
解方程.
1.2
7.5
=
0.4
x
3x-0.8×75%=2.13.2×37.5%+5.3×0.375+1.5×
3
8
答案

(1)

1.2
7.5
=
0.4
x

1.2x=7.5×0.4,

1.2x=3,

1.2x÷1.2=3÷1.2,

x=2.5;

(2)3x-0.8×75%=2.1,

3x-0.6+0.6=2.1+0.6,

3x=2.7,

3x÷3=2.7÷3,

x=0.9;

(3)3.2×37.5%+5.3×0.375+1.5×

3
8

=(3.2+5.3+1.5)×0.375,

=10×0.375,

=3.75.

解答题
单项选择题 A1型题