发布网友 发布时间:2024-10-21 17:50
共3个回答
热心网友 时间:2024-10-26 15:18
小学数学有几个注意!
第一题,分数相乘,分子和分母相同对消,不同分母的分数相加先通分。
第二题,分子分母同时除以5,
第三题,用乘法分配率,能够不化而且能直接计算的先凑起来。
第四题,看不明白你的意思。
第五题,乘法分配率,把能够消去的消去,化成2*3*4*1/2+2*3*4*1/3+2*3*4*1/4,也就是消去分母。
热心网友 时间:2024-10-26 15:13
1/5+4/5*5/6
=1/5+1/5x4x5/6
=1/5x(1+10/3)
=1/5x13/3
=13/15
5/(5/6+5/9)
=5x6/5+5x9/5
=6+9
=15
1.8*1/7-0.4/7
=1.8*1/7-0.4x1/7
=1/7x(1.8-0.4)
=1/7x1.4
=0.2
1/3(0.75+0,25除以2/3)
=1/3x(1/4+1/4x3/2)
=1/3x[1/4x(1+3/2)]
=1/3x1/4x5/2
=5/24
2*3*4*(1/2+1/3+1/4)
=24x1/2+24x1/3+24x1/4
=12+8+6
=26
热心网友 时间:2024-10-26 15:14
1/5+4/5*5/6
=1/5+1/5x4x5/6
=1/5x(1+10/3)
=1/5x13/3
=13/15
5/(5/6+5/9)
=5x6/5+5x9/5
=6+9
=15
1.8*1/7-0.4/7
=1.8*1/7-0.4x1/7
=1/7x(1.8-0.4)
=1/7x1.4
=0.2
1/3(0.75+0,25除以2/3)
=1/3x(1/4+1/4x3/2)
=1/3x[1/4x(1+3/2)]
=1/3x1/4x5/2
=5/24
2*3*4*(1/2+1/3+1/4)
=24x1/2+24x1/3+24x1/4
=12+8+6
=26