用简便方法和递等式计算:(1)2005×18-200.5×90+20050×0.1(2)(0.75×2.6×2.7)÷(0.13×0.25×9)(3)(2+3.15+5.87)×(3.15+5.87+7.32)-(2+3.15+5.87+7.32)×(3.15+5.87)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/19 10:09:39
![用简便方法和递等式计算:(1)2005×18-200.5×90+20050×0.1(2)(0.75×2.6×2.7)÷(0.13×0.25×9)(3)(2+3.15+5.87)×(3.15+5.87+7.32)-(2+3.15+5.87+7.32)×(3.15+5.87)](/uploads/image/z/265372-52-2.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E5%92%8C%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%892005%C3%9718-200.5%C3%9790%2B20050%C3%970.1%EF%BC%882%EF%BC%89%EF%BC%880.75%C3%972.6%C3%972.7%EF%BC%89%C3%B7%EF%BC%880.13%C3%970.25%C3%979%EF%BC%89%EF%BC%883%EF%BC%89%EF%BC%882%2B3.15%2B5.87%EF%BC%89%C3%97%EF%BC%883.15%2B5.87%2B7.32%EF%BC%89-%EF%BC%882%2B3.15%2B5.87%2B7.32%EF%BC%89%C3%97%EF%BC%883.15%2B5.87%EF%BC%89)
用简便方法和递等式计算:(1)2005×18-200.5×90+20050×0.1(2)(0.75×2.6×2.7)÷(0.13×0.25×9)(3)(2+3.15+5.87)×(3.15+5.87+7.32)-(2+3.15+5.87+7.32)×(3.15+5.87)
用简便方法和递等式计算:
(1)2005×18-200.5×90+20050×0.1
(2)(0.75×2.6×2.7)÷(0.13×0.25×9)
(3)(2+3.15+5.87)×(3.15+5.87+7.32)-(2+3.15+5.87+7.32)×(3.15+5.87)
用简便方法和递等式计算:(1)2005×18-200.5×90+20050×0.1(2)(0.75×2.6×2.7)÷(0.13×0.25×9)(3)(2+3.15+5.87)×(3.15+5.87+7.32)-(2+3.15+5.87+7.32)×(3.15+5.87)
(1)2005×18-200.5×90+20050×0.1
=2005×18-2005×9+2005
=2005×(18-9+1)
=2005×10
=20050
(2)(0.75×2.6×2.7)÷(0.13×0.25×9)
=(0.75×0.25)×(2.6×0.13)×(2.7÷9)
=3×20×0.3
=18
(3)(2+3.15+5.87)×(3.15+5.87+7.32)-(2+3.15+5.87+7.32)×(3.15+5.87)
=2×(3.14+5.87+7.32)+(3.15+5.87)×(3.15+5.87+7.32)-2×(3.15+5.87)-(3.15+5.87+7.32)×(3.15+5.87)
=2×(3.15+5.87+7.32)-2×(3.15+5.87)
=2×7.32
=14.64