解方程2-2(3+X)=-2
2-6-2x=-2
2x=-2
x=-1
-10+8除以(-2) -(-4)x(-3)
先化简,后求 值
(-10+8)/(-2)-(-4)*(-3)
=(-2)/(-2)-4*3
=1-12
=-11
2(a b+2b -ab )+3a -(2ab b-3ab +3b )-4b,其中a=-3 b=2
=2(a b -ab+2b )+3a -(-ab +3b )-4b
=4b+3a+ab-3b-4b
=3a+ab-3b
=3*(-3)+(-3)*2-3*2
=-9-6-6
=-21