
用简便方法计算,并要写出简算的过程.(1)23+2.46+73+5.54(2)34.25-1.72-2.28(3)2.5×(1.
用简便方法计算,并要写出简算的过程.(1)23+2.46+73+5.54(2)34.25-1.72-2.28(3)2.5×(1.9+1.9+1.9+1.9)(4)56×(...
用简便方法计算,并要写出简算的过程.(1)23+2.46+73+5.54(2)34.25-1.72-2.28(3)2.5×(1.9+1.9+1.9+1.9)(4)56×( 47+58-34)
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(1)
+2.46+
+5.54
=(
+
)+(2.46+5.54)
=3+8
=11
(2)34.25-1.72-2.28
=34.25-(1.72+2.28)
=34.25-4
=30.25
(3)2.5×(1.9+1.9+1.9+1.9)
=2.5×1.9×4
=(2.5×4)×1.9
=10×1.9
=19
(4)56×(
+
-
)
=56×
+56×
-56×
=32+35-42
=25
2 |
3 |
7 |
3 |
=(
2 |
3 |
7 |
3 |
=3+8
=11
(2)34.25-1.72-2.28
=34.25-(1.72+2.28)
=34.25-4
=30.25
(3)2.5×(1.9+1.9+1.9+1.9)
=2.5×1.9×4
=(2.5×4)×1.9
=10×1.9
=19
(4)56×(
4 |
7 |
5 |
8 |
3 |
4 |
=56×
4 |
7 |
5 |
8 |
3 |
4 |
=32+35-42
=25
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