脱式计算. 3375÷27×12(0.75+10.2)÷0.25×25%(4-1.6×)÷42×[1-(-)].
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解:
(1)3375÷27×12,
=125×12,
=1500;
(2)(0.75+10.2)÷0.25×25%,
=10.95÷0.25×0.25,
=10.95÷(0.25÷0.25),
=10.95;
(3)(4-1.6×)÷4,
=(4-1.2)÷4,
=3.6÷4,
=0.8;
(4)2×[1-(-)],
=2×[1-],
=2×1,
=.
解析分析:(1)按照从左向右的顺序进行计算;(2)先算小括号里面的加法,再按照从左向右的顺序进行计算;(3)先算乘法,再算减法,最后算除法;(4)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.