题目内容
| 脱式计算,能简算的要简算. (1)772-317+128×5 | (2)(
| (3)1.75+6.8+3.2+0.25 | ||||||
| (4)17×99+17 | (5)120÷〔45×(1-
| (6)86.5-(1.7×6+0.8) |
(1)772-317+128×5,
=772-317+640,
=455+640,
=1095;
(2)(
-
)÷(2-
),
=
÷
,
=
;
(3)1.75+6.8+3.2+0.25,
=(1.75+0.25)+(6.8+3.2),
=2+10,
=12;
(4)17×99+17,
=17×(99+1),
=17×100,
=1700;
(5)120÷[45×(1-
)],
=120÷[45×
],
=120÷5,
=24;
(6)86.5-(1.7×6+0.8),
=86.5-(10.2+0.8),
=86.5-11,
=75.5.
=772-317+640,
=455+640,
=1095;
(2)(
| 11 |
| 12 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 2 |
| 12 |
| 3 |
| 2 |
=
| 1 |
| 9 |
(3)1.75+6.8+3.2+0.25,
=(1.75+0.25)+(6.8+3.2),
=2+10,
=12;
(4)17×99+17,
=17×(99+1),
=17×100,
=1700;
(5)120÷[45×(1-
| 8 |
| 9 |
=120÷[45×
| 1 |
| 9 |
=120÷5,
=24;
(6)86.5-(1.7×6+0.8),
=86.5-(10.2+0.8),
=86.5-11,
=75.5.
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