问题 解答题
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.
答案

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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