计算下列各题125-25×6÷30 ( 2 3 + 2 15 )×45 1.8+4.3+0.7+4.2 8.3×9.9

2024-12-04 21:04:45
推荐回答(1个)
回答1:

(1)125-25×6÷30
=125-150÷30,
=125-5,
=120;
(2)(
2
3
+
2
15
)×45
=
2
3
×45
+
2
15
×45,
=30+6,
=36;
(3)1.8+4.3+0.7+4.2
=(1.8+4.2)+(4.3+0.7),
=6+5,
=11;
(4)8.3×9.9+8.3×0.1
=(9.9+0.1)×8.3,
=10×8.3,
=83;
(5)25×16×50×0.13
=(25×4)×(4×50)×0.13,
=100×200×0.13,
=2600;
(6)
1
2
+0.45÷0.9-
5
8

=
1
2
+0.5-
5
8

=1-
5
8

=
3
8