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幼苗
共回答了25个问题采纳率:96% 举报
(1)125×4÷10-20,
=500÷10-20,
=50-20,
=30;
(2)7.1×15.4-5.4×7.1,
=7.1×(15.4-5.4),
=7.1×10,
=71;
(3)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(4)
5
7 ×
3
4 +
2
7 ÷
4
3 ,
=
5
7 ×
3
4 +
2
7 ×
3
4 ,
=(
5
7 +
2
7 )×
3
4 ,
=1×
3
4 ,
=
3
4 ;
(5)1÷[
1
2 ×(
6
5 -
7
10 )],
=1÷[
1
2 ×
1
2 ],
=1 ÷
1
4 ,
=4;
(6) (
3
7 +
3
5 )×7+
4
5 ,
=
3
7 ×7+
3
5 ×7+
4
5 ,
=3+
21
5 +
4
5 ,
=3+(
21
5 +
4
5 ),
=3+5,
=8.
1年前
6