题目内容
脱式计算(能简算的要简算).
(1)99×99+99
(2)[(
+2.1)×
]÷0.9
(3)8÷8÷0.125
(4)37×39-29×37
(5)1.8÷2.7÷0.6×2.7
(6)0.5+[
÷(0.15+
)].
(1)99×99+99
(2)[(
| 3 |
| 20 |
| 4 |
| 7 |
(3)8÷8÷0.125
(4)37×39-29×37
(5)1.8÷2.7÷0.6×2.7
(6)0.5+[
| 5 |
| 6 |
| 9 |
| 20 |
(1)99×99+99,
=99×(99+1),
=99×100,
=9900;
(2)[(
+2.1)×
]÷0.9,
=[2.25×
]÷0.9,
=
×
,
=
;
(3)8÷8÷0.125,
=1÷0.125,
=8;
(4)37×39-29×37,
=37×(39-29),
=37×10,
=370;
(5)1.8÷2.7÷0.6×2.7,
=1.8×
×
×2.7,
=(1.8×
)×(2.7×
),
=3×1,
=3;
(6)0.5+[
÷(0.15+
)],
=0.5+[
÷
],
=0.5+
,
=
.
=99×(99+1),
=99×100,
=9900;
(2)[(
| 3 |
| 20 |
| 4 |
| 7 |
=[2.25×
| 4 |
| 7 |
=
| 9 |
| 7 |
| 10 |
| 9 |
=
| 10 |
| 7 |
(3)8÷8÷0.125,
=1÷0.125,
=8;
(4)37×39-29×37,
=37×(39-29),
=37×10,
=370;
(5)1.8÷2.7÷0.6×2.7,
=1.8×
| 1 |
| 2.7 |
| 1 |
| 0.6 |
=(1.8×
| 1 |
| 0.6 |
| 1 |
| 2.7 |
=3×1,
=3;
(6)0.5+[
| 5 |
| 6 |
| 9 |
| 20 |
=0.5+[
| 5 |
| 6 |
| 12 |
| 20 |
=0.5+
| 25 |
| 18 |
=
| 17 |
| 9 |
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