能简算的要简算 2.5×45+6.5×80%+0.8 3.8×4.2+38×0.58 47.5-(0.6+6.4÷0.32) 40÷[47
能简算的要简算2.5×45+6.5×80%+0.83.8×4.2+38×0.5847.5-(0.6+6.4÷0.32)40÷[47×(12+38)]134?916÷34+...
能简算的要简算 2.5×45+6.5×80%+0.8 3.8×4.2+38×0.58 47.5-(0.6+6.4÷0.32) 40÷[47×(12+38)] 134?916÷34+1522 0.32÷[12.8÷(0.25+0.15)].
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(1)2.5×
+6.5×80%+0.8,
=0.8×(2.5+6.5+1),
=0.8×10,
=8;
(2)3.8×4.2+38×0.58,
=3.8×(4.2+5.8),
=3.2×10,
=32;
(3)47.5-(0.6+6.4÷0.32),
=47.5-(0.6+20),
=47.5-20.6,
=26.9;
(4)40÷[
×(
+
)],
=40÷[
×
],
=40÷
,
=80;
(5)1
-
÷
+
,
=1
?
+
,
=1+
,
=1
;
(6)0.32÷[12.8÷(0.25+0.15)],
=0.32÷[12.8÷0.4],
=0.32÷32,
=0.01.
4 |
5 |
=0.8×(2.5+6.5+1),
=0.8×10,
=8;
(2)3.8×4.2+38×0.58,
=3.8×(4.2+5.8),
=3.2×10,
=32;
(3)47.5-(0.6+6.4÷0.32),
=47.5-(0.6+20),
=47.5-20.6,
=26.9;
(4)40÷[
4 |
7 |
1 |
2 |
3 |
8 |
=40÷[
4 |
7 |
7 |
8 |
=40÷
1 |
2 |
=80;
(5)1
3 |
4 |
9 |
16 |
3 |
4 |
15 |
22 |
=1
3 |
4 |
3 |
4 |
15 |
22 |
=1+
15 |
22 |
=1
15 |
22 |
(6)0.32÷[12.8÷(0.25+0.15)],
=0.32÷[12.8÷0.4],
=0.32÷32,
=0.01.
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