题目内容
计算
(1)(3
-3
×
)×0.7×
(2)7.816×1.45+1.69×7.816+3.14×2.184
(3)
×4.69+3.21×10
+7.9÷1
(4)(1+
)+(2+
×2)+(3+
×3)+…+(11+
×11).
(1)(3
| 4 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
| 1 |
| 6 |
(2)7.816×1.45+1.69×7.816+3.14×2.184
(3)
| 2 |
| 15 |
| 2 |
| 5 |
| 2 |
| 13 |
(4)(1+
| 7 |
| 11 |
| 7 |
| 11 |
| 7 |
| 11 |
| 7 |
| 11 |
(1)(3
-3
×
)×0.7×
,
=3
×(1-
)×0.7×
,
=
×
×0.7×
,
=0.25;
(2)7.816×1.45+1.69×7.816+3.14×2.184,
=7.816×(1.45+1.69)+3.14×2.184,
=7.816×3.14+3.14×2.184,
=3.14×(7.186+2.184),
=3.14×9.37,
=3.14×(10-0.63),
=31.4-1.9782,
=29.4218;
(3)
×4.69+3.21×10
+7.9÷1
,
=
×2×4.69+3.21×156×
+7.9×13×
),
=
×[2×4.69+3.21×156+7.9×13],
=
×[(2×7.9+150×3.21+7.9×13),
=
×(15×7.9+150×3.21),
=7.9+32.1,
=40;
(4)(1+
)+(2+
×2)+(3+
×3)+…+(11+
×11),
=(1+2+3+…+11)+(
+
×2+
×3+…+
×11),
=(1+11)×11÷2+
×(1+11)×11÷2,
=66+
×66,
=66+42,
=108.
| 4 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
| 1 |
| 6 |
=3
| 4 |
| 7 |
| 2 |
| 5 |
| 1 |
| 6 |
=
| 25 |
| 7 |
| 3 |
| 5 |
| 1 |
| 6 |
=0.25;
(2)7.816×1.45+1.69×7.816+3.14×2.184,
=7.816×(1.45+1.69)+3.14×2.184,
=7.816×3.14+3.14×2.184,
=3.14×(7.186+2.184),
=3.14×9.37,
=3.14×(10-0.63),
=31.4-1.9782,
=29.4218;
(3)
| 2 |
| 15 |
| 2 |
| 5 |
| 2 |
| 13 |
=
| 1 |
| 15 |
| 1 |
| 15 |
| 1 |
| 15 |
=
| 1 |
| 15 |
=
| 1 |
| 15 |
=
| 1 |
| 15 |
=7.9+32.1,
=40;
(4)(1+
| 7 |
| 11 |
| 7 |
| 11 |
| 7 |
| 11 |
| 7 |
| 11 |
=(1+2+3+…+11)+(
| 7 |
| 11 |
| 7 |
| 11 |
| 7 |
| 11 |
| 7 |
| 11 |
=(1+11)×11÷2+
| 7 |
| 11 |
=66+
| 7 |
| 11 |
=66+42,
=108.
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