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计算:(1)(-8)-(-1) (2)45+(-30) (3)-1.5-(-11.5) (4)-1/4-(-1/2) (5)15-[1-(-20-4)] (6)-40-28-(-19)+(-24) (7)22.54+(-4.4)+(-12.54)+4.4 (8) (2/3-1/2)-(1/3-5/6) (9)2.4-(-3/5)+(-3.1)+4/5 (10)(-6/13)+(-7/13)-(-2)(11)3/4-(-11/6)+(-7/3)(12)11+(-22)-3×(-11)(13)(-0.1)÷1/2×(-100)(14)(-3/4)×(-2/3 - 1/3) ×0(15)(-2)3-32(16)23÷[(-2)3-(-4)](17)(3/4-7/8)÷(-7/8)(18)(-60)×(3/4+5/6)