l1218y
幼苗
共回答了13个问题采纳率:92.3% 举报
(1)1.7+5
1
50 +3.98,
=1.7+(5
1
50 +3.98),
=1.7+9,
=10.7;
(2)17.625-(4.4+7
5
8 ),
=17.625-4.4-7
5
8 ,
=17.625-7
5
8 -4.4,
=10-4.4,
=5.6;
(3)3.35×6.4×2+6.7×3.6,
=(3.35×2)×6.4+6.7×3.6,
=6.7×6.4+6.7×3.6,
=6.7×(6.4+3.6),
=6.7×10,
=67;
(4)0.25×48×1.25,
=0.25×(6×8)×1.25,
=(0.25×6)×(8×1.25),
=1.5×10,
=15;
(5)3.34-5÷17-
3
17 ×4,
=3.34-
5
17 -
12
17 ,
=3.34-(
5
17 +
12
17 ),
=3.34-1,
=2.34;
(6)
9
17 -(
1
17 -
1
27 )×9,
=
9
17 -(
1
17 ×9-
1
27 ×9),
=
9
17 -
9
17 +
1
3 ,
=
1
3 .
1年前
10