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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