脱式计算,能简算得简算
1.75-(2/3+3/4)1/8乘58+1/8乘41+1/85/7除1/9乘2/7。5/9-0.375+11/18-5/87/8乘12.5除7/24乘8...
1.75-(2/3+3/4) 1/8乘58+1/8乘41+1/8
5/7除1/9乘2/7。 5/9-0.375+11/18-5/8
7/8乘12.5除7/24乘8 展开
5/7除1/9乘2/7。 5/9-0.375+11/18-5/8
7/8乘12.5除7/24乘8 展开
1个回答
2011-04-20
展开全部
1:1.75-(2/3+3/4)
=1.75-2/3-3/4
=1.75-2/3-0.75
=1-2/3=1/3
2:1/8乘58+1/8乘41+1/8
=1/8(58+41+1)=1/8×100=12.5
3:5/7除1/9乘2/7
=5/7×9×2/7=90/49
4:5/9-0.375+11/18-5/8
=10/18-3/8+11/18-5/8
=21/18-1
=3/18=1/6
5:7/8乘12.5除7/24乘8
=7/8×12.5×24/7×8
=7/8×24/7×12.5×8
=3×100=300
=1.75-2/3-3/4
=1.75-2/3-0.75
=1-2/3=1/3
2:1/8乘58+1/8乘41+1/8
=1/8(58+41+1)=1/8×100=12.5
3:5/7除1/9乘2/7
=5/7×9×2/7=90/49
4:5/9-0.375+11/18-5/8
=10/18-3/8+11/18-5/8
=21/18-1
=3/18=1/6
5:7/8乘12.5除7/24乘8
=7/8×12.5×24/7×8
=7/8×24/7×12.5×8
=3×100=300
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