7/8*2/3+7/8*1/3=7/8(2/3+1/3)=7/8*1=7/8
(7/8)X(4/3)+(7/8)X(2/3) =(7/8)X[(4/3)+(2/3)] =(7/8)X2 =7/4.
2/3÷7/8+7/8X1/3=(2/3+1/3)x7/8=1x7/8=7/8
8分之7乘7+8分之3=8分之1乘49+8分之1乘3=8分之1乘(49乘3)=8分之52=2分之13
从左往右,就是简便运算.
8分之(7X7+3)
八分之七乘七加八分之三 =8分之49 + 8分之3 =8分之52 =2分之13 =6又2分之1
7/8*7+3/8=7/8*(8-1)+3/8=7-7/8+3/8=7-4/8=7-1/2=6又1/2
7/8 - 1/3 -1/8 + 2/3 = ( 7/8 - 1/8 ) + ( 2/3 - 1/3 ) = 6/8 +1/3 = 3/4 + 1/3 = 9/12 + 4/12 = 13/12
=8/7*(5/3+10/3)=8/7*5=40/7 (7分之40)简便计算