计算（1）4×(-3)²+5×(-3)+7
= 108-15+7
=100
（2）(-5)²-5²-2/3³+（2/3)³
=25-25-2/27+8/27
=6/27
=2/9
解方程（1）2/3(x-3)=1/2x-1
4(x-3)=3x-6
4x-12=3x-6
x=6
(2)3(x-1)-2(3/2x-1)=4(x-1)
3x-3-3x+2=4x-4
4x=-5
x=-5/4