(1)(0.375 ÷
3
8 +11)×
1
4
=(1+11)×
1
4 ,
=3;
答:积是3.
(2)
4
5 ÷ (42×
5
6 -32 )
=
4
5 ÷ (35-32),
=
4
5 ÷3 ,
=
4
15 ;
答:商是
4
15 .
(3)设这个数为x,可得方程:
(2x+3)÷1.8=2.8
2x+3=5.04
2x=2.04
x=1.02;
答:这个数为1.02.
(1)(0.375 ÷
3
8 +11)×
1
4
=(1+11)×
1
4 ,
=3;
答:积是3.
(2)
4
5 ÷ (42×
5
6 -32 )
=
4
5 ÷ (35-32),
=
4
5 ÷3 ,
=
4
15 ;
答:商是
4
15 .
(3)设这个数为x,可得方程:
(2x+3)÷1.8=2.8
2x+3=5.04
2x=2.04
x=1.02;
答:这个数为1.02.