题目内容

计算.(能简便计算的要简便计算)
100.4-9+0.77÷1.1
98.7×0.9+98.7
8
9
÷[(
2
5
+
1
10
)×
3
4
]
12-
3
5
×7-
3
5
×3.
①100.4-9+0.77÷1.1,
=100.4-9+0.7,
=91.4+0.7,
=92.1;

②98.7×0.9+98.7,
=98.7×(0.9+1),
=187.53;

8
9
÷[(
2
5
+
1
10
)×
3
4
]
=
8
9
÷[(
4
10
+
1
10
)×
3
4
]
=
8
9
÷
3
8

=
64
27


④12-
3
5
×7-
3
5
×3,
=12-
3
5
×(7-3),
=12-2.4,
=9.6;
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