计算及化简:(1)(-3-5)-(6-10)(2)4÷(-2)-2 2 (3)( 1 3 - 1 2 +
计算及化简:(1)(-3-5)-(6-10)(2)4÷(-2)-22(3)(13-12+15)×30(4)2a+3b-3a+6(5)4x2-8x+5-(3x2-6x+2)...
计算及化简:(1)(-3-5)-(6-10)(2)4÷(-2)-2 2 (3)( 1 3 - 1 2 + 1 5 )×30(4)2a+3b-3a+6(5)4x 2 -8x+5-(3x 2 -6x+2)(6)(3x 2 -xy)-2(x 2 +xy)
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(1)(-3-5)-(6-10) =-8-(-4) =-8+4 =-4; (2)4÷(-2)-2 2 =-2-4 =-6; (3)(
=
=10-15+6 =1; (4)2a+3b-3a+6 =2a-3a+3b+6 =-a+3b+6; (5)4x 2 -8x+5-(3x 2 -6x+2) =4x 2 -8x+5-3x 2 +6x-2 =4x 2 -3x 2 -8x+6x+5-2 =-x 2 -2x+3; (6)(3x 2 -xy)-2(x 2 +xy) =(3x 2 -xy)-2(x 2 +xy) =3x 2 -xy-2x 2 -2xy =3x 2 -2x 2 -2xy-xy =x 2 -3xy. |
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