4/5×4/7×5/4-1/3
=4/5×5/4×4/7-1/3
=1×4/7-1/3
=4/7-1/3
=12/21-7/21
=5/21
谢谢,请采纳
4/5×4/7×5/4-1/2
=4/5×5/4×4/7-1/2
=4/7-1/2
=8/14-7/14
=1/14
4/5*4/5*4/1*4/1*5/4*5/4*4*4
=(4/5*5/4)*(4/5*5/4)*(1/4*4)*(1/4*4)
=1*1*1*1
=1
4分之1,应该表示成1/4
5/9*1/5+4/5*5/9=(1/5+4/5)*5/9=5/9 提取公因式就行了 我的是拖式啊。。。太难打了,对于键盘
6/7乘4/11加4/7乘5/11用简便演算法计算
6/7乘4/11加4/7乘5/11
=4/11*6/7+4/11*5/7
=4/11*(6/7+5/7)
=4/11*11/7
=4/7
=4/5X8/5一1/2X8/5
=8/5(4/5一1/2)
=8/5X3/10
=12/25
4/5乘八乘以5/8乘1/4
=(4/5x1/4)x(8x5/8)
=1/5x5
=1
(4/5-2/3)乘5/2除5/7
=(4/5-2/3)乘(5/2×7/5)
=(4/5-2/3)乘7/2
=4/5×7/2-2/3×7/2
=14/5-7/3
=42/15-28/15
=14/15
解:原式=7/4x1/6+4/7x5/6+4/7
=7/24+4/7x(5/6+1)
=7/24+4/7x11/6
=7/24+22/21
=56/168+1+8/168
=1+64/168
=1又8/21
分析:考察拆分法和结合律的运用。
5/3加5/2乘以4/1简便计算
3/5+2/5*1/4
=3/5+1/10
=6/10+1/10
=7/10