一 1234+2341+3412+4123二 199.9×19.98-199.8×19.97三 81.5×15.8+81.5×51.8+67.6×18.5四 1+2-3+4+5-6+……+97+98-99五 5÷(7÷11)÷(11÷16)÷(16÷35)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 16:48:25
![一 1234+2341+3412+4123二 199.9×19.98-199.8×19.97三 81.5×15.8+81.5×51.8+67.6×18.5四 1+2-3+4+5-6+……+97+98-99五 5÷(7÷11)÷(11÷16)÷(16÷35)](/uploads/image/z/340498-10-8.jpg?t=%E4%B8%80+1234%2B2341%2B3412%2B4123%E4%BA%8C+199.9%C3%9719.98%EF%BC%8D199.8%C3%9719.97%E4%B8%89+81.5%C3%9715.8%2B81.5%C3%9751.8%2B67.6%C3%9718.5%E5%9B%9B+1%2B2%EF%BC%8D3%2B4%2B5%EF%BC%8D6%2B%E2%80%A6%E2%80%A6%2B97%2B98%EF%BC%8D99%E4%BA%94+5%C3%B7%EF%BC%887%C3%B711%EF%BC%89%C3%B7%EF%BC%8811%C3%B716%EF%BC%89%C3%B7%EF%BC%8816%C3%B735%EF%BC%89)
一 1234+2341+3412+4123二 199.9×19.98-199.8×19.97三 81.5×15.8+81.5×51.8+67.6×18.5四 1+2-3+4+5-6+……+97+98-99五 5÷(7÷11)÷(11÷16)÷(16÷35)
一 1234+2341+3412+4123
二 199.9×19.98-199.8×19.97
三 81.5×15.8+81.5×51.8+67.6×18.5
四 1+2-3+4+5-6+……+97+98-99
五 5÷(7÷11)÷(11÷16)÷(16÷35)
一 1234+2341+3412+4123二 199.9×19.98-199.8×19.97三 81.5×15.8+81.5×51.8+67.6×18.5四 1+2-3+4+5-6+……+97+98-99五 5÷(7÷11)÷(11÷16)÷(16÷35)
一 1234+2341+3412+4123
=(1+2+3+4)×1111
=10×1111
=11110
二 199.9×19.98-199.8×19.97
=199.9×19.98-19.98×199.7
=19.98×(199.9-199.7)
=19.98×0.2
=3.996
三 81.5×15.8+81.5×51.8+67.6×18.5
=81.5×(15.8+51.8)+67.6×18.5
=81.5×67.6+67.6×18.5
=(81.5+18.5)×67.6
=100×67.6
=6760
四 1+2-3+4+5-6+……+97+98-99
=(1+99)×99÷2-2×(3+99)×33÷2
=100×99÷2-102×33
=4950-3366
=1584
五 5÷(7÷11)÷(11÷16)÷(16÷35)
=5×11/7×16/11×35/16
=5×5
=25