题目内容
【题目】直接写数对又快.
(1)= (2)7.6×35%+6.5×0.76=
(3)1 = (4)0.25×12.5=
(5)234×99﹣166= (6)132=
【答案】(1);(2)7.6
(3);(4)100
(5)23000;(6)1
【解析】
(1)先把除法变成乘法,然后约分求解;
(2)根据乘法分配律简算;
(3)先算小括号里面的加法,再算括号外的乘法;
(4)先把除法变成乘法,再把32分解成8×4,然后根据乘法交换律和结合律简算;
(5)先把99分解成100﹣1,再根据乘法分配律简算,最后算减法;
(6)先把132分解成(131+),再根据乘法分配律简算
(1)
=×
=
(2)7.6×35%+6.5×0.76
=7.6×(35%+0.65)
=7.6×1
=7.6
(3)1
=1×
=
(4)0.25×12.5
=0.25×12.5×32
=0.25×12.5×4×8
=(0.25×4)×(12.5×8)
=1×100
=100
(5)234×99﹣166
=234×(100﹣1)﹣166
=23400﹣234﹣166
=23400﹣(234+166)
=23400﹣400
=23000
(6)132
=(131+)×
=131××
=1+
=1
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