题目内容
【题目】脱式计算,能简算的要简算。
(1) (2)10-- (3)6.9×2.5+6.9×7.5
(4)3.76÷0.4÷2.5 (5)27.3-1.2-8.8 (6)5.5×[0.72÷(4.2÷0.7)]
【答案】(1)2;(2)8;(3)69;
(4)3.76;(5)17.3;(6)0.66
【解析】
(1)按照加法交换律和结合律计算;
(2)按照减法的性质计算;
(3)按照乘法分配律计算;
(4)按照除法的性质计算;
(5)按照减法的性质计算;
(6)先算小括号里面的除法,再算中括号里面的除法,最后算乘法。
(1)
=(+)+(+)
=1+1
=2
(2)10--
=10-()
=10-2
=8
(3)6.9×2.5+6.9×7.5
=(2.5+7.5)×6.9
=10×6.9
=69
(4)3.76÷0.4÷2.5
=3.76÷(0.4×2.5)
=3.76÷1
=3.76
(5)27.3-1.2-8.8
=27.3-(1.2+8.8)
=27.3-10
=17.3
(6)5.5×[0.72÷(4.2÷0.7)]
=5.5×[0.72÷6]
=5.5×0.12
=0.66
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