(-23 )*278 /(23 *23 *23 )
=》原式=-(278/529)
130 -(-23 +35 )/(-2)
=》原式=136
16X-40=9X+16
=》7X=56
=》X=8
4X=203 X+16
=》-199X=16
=》X=-(199/16)
2(3-X)=-4(X+5)
=》6-2X=-4X-20
=》2X=-26
=》X=-13
3(-2X-5)2X=9
=》-12X^2-30X=9
=》12X^2+30X+9=0
=》4X^2+10X+3
12 (X-4)-3X+4)=-152
不明白
X-74 -5X+83 =1
-4X=-8
X=2