计算下列各题.(1) - 2 3 +(π-3.14 ) 0 -(1-2 1 2 )×(- 1 2 ) -1 (2
计算下列各题.(1)-23+(π-3.14)0-(1-212)×(-12)-1(2)(-ab2)3?(-9a3b)÷(-3a3b5)(3)(2x-y)(2x+y)-(x-...
计算下列各题.(1) - 2 3 +(π-3.14 ) 0 -(1-2 1 2 )×(- 1 2 ) -1 (2)(-ab 2 ) 3 ?(-9a 3 b)÷(-3a 3 b 5 )(3)(2x-y)(2x+y)-(x-3y) 2 .
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(1) - 2 3 +(π-3.14 ) 0 -(1-2
=-8+1-3 =-10 (2)(-ab 2 ) 3 ?(-9a 3 b)÷(-3a 3 b 5 ) =-a 3 b 6 ?(-9a 3 b)÷(-3a 3 b 5 ) =9a 6 b 7 ÷(-3a 3 b 5 ) =-3a 3 b 2 (3)(2x-y)(2x+y)-(x-3y) 2 . =4x 2 -y 2 -x 2 +6xy-9y 2 =3x 2 -10y 2 +6xy |
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