题目内容

计算(能简算的要简算)
(1)(
8
9
×
8
9
+
8
9
×
1
9
)×18.5;
(2)
7
13
×8+
7
13
+4×
7
13

(3)2.8×4.1+0.28×59;
(4)26.7-1.7×5-1.5.
(1)(
8
9
×
8
9
+
8
9
×
1
9
)×18.5,
=
8
9
×
8
9
+
1
9
)×18
1
2

=
8
9
×1×
37
2

=
148
9

=16
4
9


(2)
7
13
×8+
7
13
+4×
7
13

=
7
13
×
(8+1+4),
=
7
13
×
13,
=7;

(3)2.8×4.1+0.28×59,
=2.8×4.1+2.8×5.9,
=2.8×(4.1+5.9),
=2.8×10,
=28;

(4)26.7-1.7×5-1.5,
=26.7-8.5-1.5,
=26.7-(8.5+1.5),
=26.7-10,
=16.7.
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