题目内容
4
×2
+4
×4
+6
×4
61
×
+71
×
+91
×
.
7 |
13 |
1 |
7 |
2 |
7 |
7 |
13 |
4 |
7 |
7 |
13 |
61
1 |
5 |
5 |
6 |
1 |
6 |
6 |
7 |
1 |
8 |
8 |
9 |
(1)4
×2
+4
×4
+6
×4
,
=4
×(2
+4
+6
),
=4
×13,
=(4+
)×13,
=4×13+
×13,
=52+7,
=59;
(2)61
×
+71
×
+91
×
,
=(60+
)×
+(70+
)×
+(90+
)×
,
=60×
+
×
+70×
+
×
+90×
+
×
,
=50+1+60+1+80+1,
=(50+60+80)+(1+1+1),
=190+3,
=193.
7 |
13 |
1 |
7 |
2 |
7 |
7 |
13 |
4 |
7 |
7 |
13 |
=4
7 |
13 |
1 |
7 |
2 |
7 |
4 |
7 |
=4
7 |
13 |
=(4+
7 |
13 |
=4×13+
7 |
13 |
=52+7,
=59;
(2)61
1 |
5 |
5 |
6 |
1 |
6 |
6 |
7 |
1 |
8 |
8 |
9 |
=(60+
6 |
5 |
5 |
6 |
7 |
6 |
6 |
7 |
9 |
8 |
8 |
9 |
=60×
5 |
6 |
6 |
5 |
5 |
6 |
6 |
7 |
7 |
6 |
6 |
7 |
8 |
9 |
9 |
8 |
8 |
9 |
=50+1+60+1+80+1,
=(50+60+80)+(1+1+1),
=190+3,
=193.
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