计算题:(1)-3-(-4)+7(2) 8×(- 4 5 )÷|-16| (3) ( 3 8 - 1 6 -
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×...
计算题:(1)-3-(-4)+7(2) 8×(- 4 5 )÷|-16| (3) ( 3 8 - 1 6 - 3 4 )×(-24) (4) (-2 ) 2 -|-6|+2-3×(- 1 3 ) (5) (- 1 2 )+2×(-0.5 ) 2 + 3 2 ÷(-3) (6) - 3 2 -[-5-0.2÷ 4 5 × (-2) 2 ] .
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(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) - 3 2 -[-5-0.2÷
=-9-[-5-
=-9-(-5-1) =-9-[(-5)+(-1)] =-9-(-6) =-9+6 =-(9-6) =-3. |
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