qutebaby
春芽
共回答了15个问题采纳率:93.3% 举报
①3.1+2.4+1.9+3.6
=(3.1+1.9)+(2.4+3.6)
=5+6
=11;
②4.2×99+4.2
=4.2×(99+1)
=4.2×100
=420;
③24×(
3
8 +
5
6 )
=24×
3
8 +24×
5
6
=9+20
=29;
④
7
9 ÷
11
5 +
5
11 ×
2
9
=
7
9 ×
5
11 +
5
11 ×
2
9
=
5
11 ×(
7
9 +
2
9 )
=
5
11 ×1
=
5
11 .
1年前
2