6道奥数题 1.50×84/89+46*42/89+84*26/891.50×84/89+46*42/89+84*26/89 2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125 3.77*1/8+7/8*23又 10/13+7/13*3/8
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 20:06:33
![6道奥数题 1.50×84/89+46*42/89+84*26/891.50×84/89+46*42/89+84*26/89 2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125 3.77*1/8+7/8*23又 10/13+7/13*3/8](/uploads/image/z/5286058-34-8.jpg?t=6%E9%81%93%E5%A5%A5%E6%95%B0%E9%A2%98%E3%80%80%E3%80%801%EF%BC%8E50%C3%9784%2F89%EF%BC%8B46%2A42%2F89%2B84%2A26%2F891.50%C3%9784%2F89%EF%BC%8B46%2A42%2F89%2B84%2A26%2F89+2.13%E5%8F%88+4%2F19%2B86%E5%8F%88+15%2F19%2A0.25%2B0.625%2A86%E5%8F%88+15%2F19%2B86%E5%8F%88+15%2F19%2A0.125%E3%80%80%E3%80%80%E3%80%80%E3%80%80%E3%80%803%EF%BC%8E77%2A1%2F8%2B7%2F8%2A23%E5%8F%88+10%2F13%2B7%2F13%2A3%2F8)
6道奥数题 1.50×84/89+46*42/89+84*26/891.50×84/89+46*42/89+84*26/89 2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125 3.77*1/8+7/8*23又 10/13+7/13*3/8
6道奥数题 1.50×84/89+46*42/89+84*26/89
1.50×84/89+46*42/89+84*26/89 2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125 3.77*1/8+7/8*23又 10/13+7/13*3/8
6道奥数题 1.50×84/89+46*42/89+84*26/891.50×84/89+46*42/89+84*26/89 2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125 3.77*1/8+7/8*23又 10/13+7/13*3/8
1.50×84/89+46*42/89+84*26/89
=50×84/89+23×84/89+84×26/89
=84/89(50+23+26)
=84*99/89
=8316/89
2.13又 4/19+86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125
=13又 4/19+86又 15/19(*0.25+0.625+0.125)
=13又 4/19+86又 15/19*1
=13+86+4/19+15/19
=99+1
=100
3.77*1/8+7/8*23又 10/13+7/13*3/8
=11*7/8+7/8*23又 10/13+7/8*3/13
=7/8(11+23+10/13+3/13)
=7/8*(35)
=245/8
50×84/89+46*42/89+84*26/89
=(50*2*42+23*2*42+84+26)/89
=(50*84+23*84+84*26)/89
=(50+23+26)/89
=84*99/89
=8316/89
第二题用乘法分配律,可以把86又 15/19看做公共的因数提取出来,先计算86又 15/19*0.25+0.625*86又 15/19+86又 15/19*0.125 再加13又 4/19