请用简便方法计算. 58+34+42 26+(74+66) 16×50×2 (39×4)×25 25×24 15×14
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解决时间 2021-01-22 10:35
- 提问者网友:寂寞梧桐
- 2021-01-21 18:34
请用简便方法计算. 58+34+42 26+(74+66) 16×50×2 (39×4)×25 25×24 15×14
最佳答案
- 五星知识达人网友:人间朝暮
- 2021-01-21 19:48
(1)58+34+42
=(58+42)+34
=100+34
=134;
(2)26+(74+66)
=(26+74)+66
=100+66
=166;
(3)16×50×2
=16×(50×2)
=16×100
=1600;
(4)(39×4)×25
=39×(4×25)
=39×100
=3900;
(5)25×24
=25×4×6
=(25×4)×6
=100×6
=600;
(6)15×14
=(10+5)×14
=10×14+5×14
=140+70
=210.
=(58+42)+34
=100+34
=134;
(2)26+(74+66)
=(26+74)+66
=100+66
=166;
(3)16×50×2
=16×(50×2)
=16×100
=1600;
(4)(39×4)×25
=39×(4×25)
=39×100
=3900;
(5)25×24
=25×4×6
=(25×4)×6
=100×6
=600;
(6)15×14
=(10+5)×14
=10×14+5×14
=140+70
=210.
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