题目内容
(1)6.3×3.7-6.3+6.3×7.3
(2)(48.2+20.7+51.8+4.3)×8.88.
解:
(1)6.3×3.7-6.3+6.3×7.3,
=6.3×(3.7-1+7.3),
=6.3×10,
=63;
(2)(48.2+20.7+51.8+4.3)×8.88,
=[(48.2+51.8)+(20.7+4.3)]×8.88,
=[100+25]×8.88,
=125×8.88,
=125×(8×1.11),
=(125×8)×1.11,
=1000×1.11,
=1110.
分析:(1)根据乘法分配律进行计算;
(2)根据加法交换律和结合律与乘法交换律和结合律进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
(1)6.3×3.7-6.3+6.3×7.3,
=6.3×(3.7-1+7.3),
=6.3×10,
=63;
(2)(48.2+20.7+51.8+4.3)×8.88,
=[(48.2+51.8)+(20.7+4.3)]×8.88,
=[100+25]×8.88,
=125×8.88,
=125×(8×1.11),
=(125×8)×1.11,
=1000×1.11,
=1110.
分析:(1)根据乘法分配律进行计算;
(2)根据加法交换律和结合律与乘法交换律和结合律进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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例:
3÷3+3-3=1 33÷33=1(1)
|
① 3 3 3 3=1 |
② 3 3 3 3=2 |
|
③ 3 3 3 3=3 |
④ 3 3 3 3=4 |
|
⑤ 3 3 3 3=5 |
⑥ 3 3 3 3=6 |
|
⑦ 3 3 3 3=7 |
⑧ 3 3 3 3=8 |
|
⑨ 3 3 3 3=9 |
⑩ 3 3 3 3=10 |
(2)
|
① 3 3 3 3=1 |
② 3 3 3 3=2 |
|
③ 3 3 3 3=3 |
④ 3 3 3 3=4 |
|
⑤ 3 3 3 3=5 |
⑥ 3 3 3 3=6 |
|
⑦ 3 3 3 3=7 |
⑧ 3 3 3 3=8 |
|
⑨ 3 3 3 3=9 |
⑩ 3 3 3 3=10 |
|
① 3 3 3 3=1 |
② 3 3 3 3=2 |
|
③ 3 3 3 3=3 |
④ 3 3 3 3=4 |
|
⑤ 3 3 3 3=5 |
⑥ 3 3 3 3=6 |
|
⑦ 3 3 3 3=7 |
⑧ 3 3 3 3=8 |
|
⑨ 3 3 3 3=9 |
⑩ 3 3 3 3=10 |