(1)9-0.64-0.36 (2)1379+450÷18×40(3) (4)(5) (6).
网友回答
解:(1)9-0.64-0.36,
=9-(0.64+0.36),
=9-1,
=8;
(2)1379+450÷18×40,
=1379+25×40,
=1379+1000,
=2379;
(3)(3),
=×18-×18,
=3-2,
=1;
(4),
=2,
=2;
(5),
=×+×,
=×(+),
=×1,
=;
(6),
=×[],
=×,
=.
解析分析:(1)根据连续减去这两个数等于减去这两个数的和简算;
(2)先算除法,再算乘法,最后算加法;
(3)运用乘法分配律简算;
(4)先算除法,再算加法;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的减法,再算中括号里面的除法,最后算括号外的乘法.
点评:考查了运算定律与运算性质,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.