=0.2*0.37+0.2*0.63+0.45
=0.2*(0.37+0.63)+0.45
=0.2+0.45
=0.65
0.8x=121-1
x=(121-1) .8
x=120*(54)
x=150
数学题；梯等式和解方程梯等式：1/5*37%+0.63*20%+45%解方程：1+80%x=121
=0.2*0.37+0.2*0.63+0.45
=0.2*(0.37+0.63)+0.45
=0.2+0.45
=0.65
0.8x=121-1
x=(121-1) .8
x=120*(54)
x=150