计算:(1)(-49)-(+91)-(-5)+(-9)(2) - 1 2 -(1-0.5)× 1 3 ×[19-(-5 ) 2 ]
计算:(1)(-49)-(+91)-(-5)+(-9)(2)-12-(1-0.5)×13×[19-(-5)2](3)5-3×{-2+4×[-3×(-2)2-(-4)÷(-...
计算:(1)(-49)-(+91)-(-5)+(-9)(2) - 1 2 -(1-0.5)× 1 3 ×[19-(-5 ) 2 ] (3)5-3×{-2+4×[-3×(-2) 2 -(-4)÷(-1) 3 ]-7}(4)(3a 2 -2)+(a 2 -3a)-(-2a 2 +5a+5)(5)5a 2 -〔a 2 +(5a 2 -2a)-2(a 2 -3a)〕.
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(1)原式=-49-91+5-9 =-144; (2)原式=-1-
=-1-
=-1+1 =0; (3)原式=5-3×{-2+4×[-3×4-(-4)÷(-1)]-7} =5-3×{-2+4×[-12-4]-7} =5-3×{-2+4×[-16]-7} =5-3×{-2-64-7} =5-3×{-66-7} =5-3×{-73} =5+219 =224; (4)原式=3a 2 -2+a 2 -3a+2a 2 -5a-5 =6a 2 -8a-7; (5)原式=5a 2 -[a 2 +5a 2 -2a-2a 2 +6a] =5a 2 -[4a 2 +4a] =5a 2 -4a 2 -4a =a 2 -4a. |
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