题目内容
看谁算得又快又对. 7×4÷7×4= |
151-77-33= | 325+480+75= | 9×125×8= |
25×7×4= | 0×240÷6= | 295-128-72= | 30×7÷10= |
分析:(1)(8)按照从左到右的顺序计算;
(2)(7)根据减法的性质简算;
(3)运用加法交换律简算;
(4)根据乘法结合律简算;
(5)运用乘法交换律简算;
(6)根据0乘上任何数都得0,以及0除以任何非0的数都得0 进行求解.
(2)(7)根据减法的性质简算;
(3)运用加法交换律简算;
(4)根据乘法结合律简算;
(5)运用乘法交换律简算;
(6)根据0乘上任何数都得0,以及0除以任何非0的数都得0 进行求解.
解答:解:(1)7×4÷7×4,
=28÷7×4,
=4×4,
=16;
(2)151-77-33,
=151-(77+33),
=151-110,
=41;
(3)325+480+75,
=(325+75)+480,
=400+480,
=880;
(4)9×125×8,
=9×(125×8),
=9×1000,
=9000;
(5)25×7×4,
=25×4×7,
=100×7,
=700;
(6)0×240÷6,
=0÷6,
=0;
(7)295-128-72,
=295-(128+72),
=295-200,
=95;
(8)30×7÷10,
=210÷7,
=30.
=28÷7×4,
=4×4,
=16;
(2)151-77-33,
=151-(77+33),
=151-110,
=41;
(3)325+480+75,
=(325+75)+480,
=400+480,
=880;
(4)9×125×8,
=9×(125×8),
=9×1000,
=9000;
(5)25×7×4,
=25×4×7,
=100×7,
=700;
(6)0×240÷6,
=0÷6,
=0;
(7)295-128-72,
=295-(128+72),
=295-200,
=95;
(8)30×7÷10,
=210÷7,
=30.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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