解方程;1/5X+1/6X=11/15 计算:0.98×9/7+0.98÷7/9=?
问题描述:
解方程;1/5X+1/6X=11/15 计算:0.98×9/7+0.98÷7/9=?
答
1/5X+1/6X=11/15
11X/30=11/15
X=2
0.98×9/7+0.98÷7/9
=0.98×9/7+0.98X9/7
=2*0.98*9/7
=2*0.14*9
=0.28*9
=2.52