解:(1)﹣42×+|﹣2|3×(﹣)3 = =﹣1﹣1 =﹣2; (2)﹣12﹣|0.5﹣|÷×[﹣2﹣(﹣3)2] = = = =; (3)解方程:4x﹣3(5﹣x)=2, 去括号,得:4x﹣15+3x=2, 移项,得:4x+3x=2+15, 合并同类项,得:7x=17, 系数化为1,得:; (4)解方程:, 去分母,得:15x﹣3(x﹣2)=5(2x﹣5)﹣3×15, 去括号,得:15x﹣3x+6=10x﹣25﹣45, 移项,得:15x﹣3x﹣10x=﹣25﹣45﹣6, 合并同类项,得:2x=﹣76, 系数化为1,得:x=﹣38. |