计算题:(1)-3-(-4)+7(2)8×(-45)÷|-16|(3)(38-16-34)×(-24)(4)(-2)2-|-6|+2-3×(-13)(5)(-12)+2×(-0.5)2+32÷(-3)(6)-32-[-5-0.2÷45×(-2)2].-数学
题文
计算题:(1)-3-(-4)+7 (2)8×(-
(3)(
(4)(-2)2-|-6|+2-3×(-
(5)(-
(6)-32-[-5-0.2÷
|
答案
(1)-3-(-4)+7 =-3+4+7 =(-3)+(4+7) =(-3)+11 =+(11-3) =8; (2)8×(-
=8×(-
=8×(-
=-8×
=-
(3)(
=
=-9+4+18 =(-9)+(4+18) =(-9)+22 =+(22-9) =13; (4)(-2)2-|-6|+2-3×(-
=4-6+2+1 =(4+2+1)-6 =7-6 =1; (5)(-
=(-
=(-
=[(-0.5)+0.5]+(-3) =0+(-3) =-3; (6)-32-[-5-0.2÷
=-9-[-5-
|