
神机妙算,细又巧.(1)1375+450÷18×25 &nb...
神机妙算,细又巧.(1)1375+450÷18×25(2)49÷(13+16)×34(3)10.89×10.69-0.69×10.89(4)203×35÷(43+27)...
神机妙算,细又巧.(1)1375+450÷18×25 (2)49÷(13+16)×34(3)10.89×10.69-0.69×10.89 (4)203×35÷(43+27)
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(1)1375+450÷18×25
=1375+25×25
=1375+625
=2000;
(2)
÷(
+
)×
=
÷
×
=
×2×
=
;
(3)10.89×10.69-0.69×10.89
=10.89×(10.69-0.69)
=10.89×10
=108.9;
(4)
×
÷(
+
)
=4÷
=4×
=
.
=1375+25×25
=1375+625
=2000;
(2)
4 |
9 |
1 |
3 |
1 |
6 |
3 |
4 |
=
4 |
9 |
1 |
2 |
3 |
4 |
=
4 |
9 |
3 |
4 |
=
2 |
3 |
(3)10.89×10.69-0.69×10.89
=10.89×(10.69-0.69)
=10.89×10
=108.9;
(4)
20 |
3 |
3 |
5 |
4 |
3 |
2 |
7 |
=4÷
34 |
21 |
=4×
21 |
34 |
=
84 |
17 |
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