x+1/2=1/5 2/3+x=4/5 x-5/9=1/3 x-1/6=1+1/6
8/15+12.6+7/15 10.2x99+10.2 14-(1/2-1/5) 15+(1/2+6/5) 要写式子
x+1/2=1/5 2/3+x=4/5 x-5/9=1/3 x-1/6=1+1/6
8/15+12.6+7/15 10.2x99+10.2 14-(1/2-1/5) 15+(1/2+6/5) 要写式子
x+1/2=1/5
x=1/5-1/2
x=-3/10
2/3+x=4/5
x=4/5-2/3
x=2/15
x-1/6=1+1/6
x=1+1/6+1/6
x=4/3
8/15+12.6+7/15
=8/15+7/15+12.6
=1+12.6
=13.6
10.2×99+10.2
=10.×99+10.2×1
=10.2×(99+1)
=10.2×100
=1020
15+(1/2+6/5)
=15+(0.5+1.2)
=16.7