
脱式计算:(能简算的要写出主要简算步骤) 2.87+5.6-0.87+4.4 &nb...
脱式计算:(能简算的要写出主要简算步骤)2.87+5.6-0.87+4.41.25×0.25×3218.5-7.35-2.6568×56938×25+0.375×76-3...
脱式计算:(能简算的要写出主要简算步骤) 2.87+5.6-0.87+4.4 1.25×0.25×32 18.5-7.35-2.65 68×569 38×25+0.375×76-37.5% 45+45÷23×59.
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(1)2.87+5.6-0.87+4.4
=(2.87-0.87)+(5.6+4.4)
=2+10
=12
(2)1.25×0.25×32
=1.25×0.25×4×8
=(1.25×8)×(0.25×4)
=10×1
=10
(3)18.5-7.35-2.65
=18.5-(7.35+2.65)
=18.5-10
=8.5
(4)68×
=(69-1)×
=69×
-1×
=5-
=4
(5)
×25+0.375×76-37.5%
=0.375×25+0.375×76-0.375
=0.375×(25+76-1)
=0.375×100
=37.5
(6)
+
÷
×
=
+
×
×
=
+
=
=(2.87-0.87)+(5.6+4.4)
=2+10
=12
(2)1.25×0.25×32
=1.25×0.25×4×8
=(1.25×8)×(0.25×4)
=10×1
=10
(3)18.5-7.35-2.65
=18.5-(7.35+2.65)
=18.5-10
=8.5
(4)68×
5 |
69 |
=(69-1)×
5 |
69 |
=69×
5 |
69 |
5 |
69 |
=5-
5 |
69 |
=4
64 |
69 |
(5)
3 |
8 |
=0.375×25+0.375×76-0.375
=0.375×(25+76-1)
=0.375×100
=37.5
(6)
4 |
5 |
4 |
5 |
2 |
3 |
5 |
9 |
=
4 |
5 |
4 |
5 |
3 |
2 |
5 |
9 |
=
4 |
5 |
2 |
3 |
=
22 |
15 |
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