xg1974
幼苗
共回答了8个问题采纳率:75% 举报
①13÷19+18×
13
19 ,
=
13
19 +18×
13
19 ,
=
13
19 ×(1+18),
=13;
②4.25+ 3
3
7 -1
1
4 +
11
7 -2,
=4.25-2+(3
3
7 +
11
7 )- 1
1
4 ,
=2.25+5- 1
1
4 ,
=2
1
4 - 1
1
4 +5,
=1+5,
=6;
③
7
2 x=2+2x,
(
7
2 -2)x=2,
3
2 x=2,
x=
4
3 .
1年前
8