Question

7/11÷9+1/4x7/11要简便运算.方程X十1/3X=4/5 X一Xx5/6=1/9x9/1

Answer 1

7/11÷9+1/4×7/11

=7/11×1/9+1/4×7/11 （除以一个数,等于乘以其倒数）

=7/11×(1/9+1/4) （提取公因数）

=7/11×13/36

=91/396

X十1/3X=4/5

4/3x=4/5

x=3/5

X一Xx5/6=1/9x9/11

x/6=1/11

x=6/11