脱式计算(能简算的用简便算法).(1)[9.2+0.8×(9-7.75)]÷0.4; (2)3.5×9.8+0.35×2;(3)28×2627; (4)[(23-35)×154+23]÷1112.
(1)[9.2+0.8×(9-7.75)]÷0.4
=[9.2+0.8×1.25]÷4
=[9.2+1]÷4
=2.55
(2)3.5×9.8+0.35×2
=3.5×(9.8+0.2)
=3.5×10
=35
(3)28×
=(27+1)×
=27×
+
=26+
=26
(4)[(
-
)×
+
]÷
=[
×
+
]÷
=[
+
]÷
=
×
=1
=[9.2+0.8×1.25]÷4
=[9.2+1]÷4
=2.55
(2)3.5×9.8+0.35×2
=3.5×(9.8+0.2)
=3.5×10
=35
(3)28×
26 |
27 |
=(27+1)×
26 |
27 |
=27×
26 |
27 |
26 |
27 |
=26+
26 |
27 |
=26
26 |
27 |
(4)[(
2 |
3 |
3 |
5 |
15 |
4 |
2 |
3 |
11 |
12 |
=[
1 |
15 |
15 |
4 |
2 |
3 |
11 |
12 |
=[
1 |
4 |
2 |
3 |
11 |
12 |
=
11 |
12 |
12 |
11 |
=1
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