题目内容
脱式计算.(能用简便方法计算用简便方法计算) 70.08-1.25-1.75 |
4.6+2.89+5.4+3.11 |
22×101 | 45×36+54×36+36 |
25×(4×27) | 85×99+85. |
分析:(1)依据减法性质解答;
(2)运用加法交换律和结合律解答;
(3)(4)(6)运用乘法分配律解答;
(5)运用乘法结合律解答.
(2)运用加法交换律和结合律解答;
(3)(4)(6)运用乘法分配律解答;
(5)运用乘法结合律解答.
解答:解:(1)70.08-1.25-1.75,
=70.08-(1.25+1.75),
=70.08-3,
=67.08;
(2)4.6+2.89+5.4+3.11,
=(4.6+5.4)+(2.89+3.11),
=10+6,
=16;
(3)22×101,
=22×100+22×1,
=2200+22,
=2222;
(4)45×36+54×36+36,
=(45+54+1)×36,
=100×36,
=3600;
(5)25×(4×27),
=(25×4)×27,
=100×27,
=2700;
(6)85×99+85,
=85×(99+1),
=85×100,
=8500.
=70.08-(1.25+1.75),
=70.08-3,
=67.08;
(2)4.6+2.89+5.4+3.11,
=(4.6+5.4)+(2.89+3.11),
=10+6,
=16;
(3)22×101,
=22×100+22×1,
=2200+22,
=2222;
(4)45×36+54×36+36,
=(45+54+1)×36,
=100×36,
=3600;
(5)25×(4×27),
=(25×4)×27,
=100×27,
=2700;
(6)85×99+85,
=85×(99+1),
=85×100,
=8500.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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