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脱式计算(能简算的要简算)(1)4×0.8×2.5×12.5(2)45×(215+29)-45(3)1.02×404(4)6.5×18.3+0.17×65.
题目详情
脱式计算(能简算的要简算)
(1)4×0.8×2.5×12.5
(2)45×(
+
)-
(3)1.02×404
(4)6.5×18.3+0.17×65.
(1)4×0.8×2.5×12.5
(2)45×(
2 |
15 |
2 |
9 |
4 |
5 |
(3)1.02×404
(4)6.5×18.3+0.17×65.
▼优质解答
答案和解析
(1)4×0.8×2.5×12.5
=(4×2.5)×(0.8×12.5)
=10×10
=100;
(2)45×(
+
)-
=45×
+45×
-
=6+10-
=15
;
(3)1.02×404
=(1+0.02)×404
=1×404+0.02×404
=404+8.08
=412.08;
(4)6.5×18.3+0.17×65
=65×1.83+0.17×65
=65×(1.83+0.17)
=65×2
=130.
=(4×2.5)×(0.8×12.5)
=10×10
=100;
(2)45×(
2 |
15 |
2 |
9 |
4 |
5 |
=45×
2 |
15 |
2 |
9 |
4 |
5 |
=6+10-
4 |
5 |
=15
1 |
5 |
(3)1.02×404
=(1+0.02)×404
=1×404+0.02×404
=404+8.08
=412.08;
(4)6.5×18.3+0.17×65
=65×1.83+0.17×65
=65×(1.83+0.17)
=65×2
=130.
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