递等式计算(能简便的要简便运算)(1)25×0.32×2.5(2)1.25×6.78+25×3.47+125×0.0382(3)(2.44-
答案:1 悬赏:20 手机版
解决时间 2021-02-03 17:39
- 提问者网友:泪痣哥哥
- 2021-02-02 20:10
递等式计算(能简便的要简便运算)(1)25×0.32×2.5(2)1.25×6.78+25×3.47+125×0.0382(3)(2.44-
最佳答案
- 五星知识达人网友:街头电车
- 2021-02-02 21:33
(1)25×0.32×2.5
=25×0.04×4×2×2.5
=(25×0.04)×(4×2.5)×2
=1×10×2
=10×2
=20;
(2)1.25×6.78+25×3.47+125×0.0382
=1.25×6.78+125×0.0382+25×3.47
=125×0.0678+125×0.0382+25×3.47
=125×(0.0678+0.0382)+25×3.47
=125×0.106+25×3.47
=25×0.53+25×3.47
=25×(0.53+3.47)
=25×4
=100;
(3)(2.44-1.8)÷0.4×20
=0.64÷0.4×20
=1.6×20
=32;
(4)5+10+15+20+25+30+…+95
=5+95+10+90+15+85+20+80+25+75+30+70+35+65+40+60+45+55+50
=(5+95)+(10+90)+(15+85)+(20+80)+(25+75)+(30+70)+(35+65)+(40+60)+(45+55)+50
=100+100+100+100+100+100+100+100+100+50
=100×9+50
=900+50
=950.
=25×0.04×4×2×2.5
=(25×0.04)×(4×2.5)×2
=1×10×2
=10×2
=20;
(2)1.25×6.78+25×3.47+125×0.0382
=1.25×6.78+125×0.0382+25×3.47
=125×0.0678+125×0.0382+25×3.47
=125×(0.0678+0.0382)+25×3.47
=125×0.106+25×3.47
=25×0.53+25×3.47
=25×(0.53+3.47)
=25×4
=100;
(3)(2.44-1.8)÷0.4×20
=0.64÷0.4×20
=1.6×20
=32;
(4)5+10+15+20+25+30+…+95
=5+95+10+90+15+85+20+80+25+75+30+70+35+65+40+60+45+55+50
=(5+95)+(10+90)+(15+85)+(20+80)+(25+75)+(30+70)+(35+65)+(40+60)+(45+55)+50
=100+100+100+100+100+100+100+100+100+50
=100×9+50
=900+50
=950.
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