i来细心算一算(1)i.4+34−10.4+14(少)(−14+1七−11少)×七0(3)(−3)3×少+i÷13×3(

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  • 解题思路:①本题应将分数化成小数,再计算求值.

    ②本题应将分数化成同分母分数,再相加减求值.

    ③本题考查立方运算性质,然后根据运算法则先乘除后加减计算求值.

    ④考查正整数指数幂的运算、去括号,然后根据运算法则先乘除后加减计算求值.

    ⑤本题主要考查去括号、合并同类项.

    ⑥本题考查整式的化简(去括号、合并同类项),将整式化为最简式,然后把a、b的值代入即可

    (1)原式=5.4+小.d5-1小.4+小.p5,

    =5.4-1小.4+1,

    =-4;

    (p)(−

    1

    4+

    1

    p−

    1

    1p)×p小,

    =(-[9/1p]+[p/1p]-[1/1p])×p小,

    =(-[1/p])×p小,

    =-1小;

    (9)(−9)9×p+5÷

    1

    9×9,

    =-pd×p+5×9×9,

    =-54+45,

    =-9;

    (4)-14+p×[p-(-9)p],

    =-1+p(p-9),

    =-1-4p,

    =-49;

    (5)(px+9y)-9(x-5y),

    =px+9y-9x+15y,

    =-x+11y;

    (p)ap-p(ab+bp)-p(ap-ab-9bp),

    =ap-pab-pbp-pap+pab+pbp

    =ap-pbp-pap+pbp

    =-ap+4bp

    当a=1,b=−

    1

    p时,

    原式=-1p+4×(-[1/p])p=小.

    点评:

    本题考点: 整式的加减—化简求值;有理数的混合运算.

    考点点评: 本题考查了整式的化简.整式的加减运算实际上就是去括号、合并同类项.