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递等式计算,能巧算的用巧算.432-158-14225+0÷25371+369+(231+29)506-298+94500-121-79888-(88+177)

题目详情
递等式计算,能巧算的用巧算.
432-158-142                          
25+0÷25371+369+(231+29)
506-298+94500-121-79                             888-(88+177)
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答案和解析
(1)432-158-142
=432-(158+142)
=432-300
=132;

(2)25+0÷25
=25+0
25;

(3)371+369+(231+29)
=(371+29)+(369+231)
=400+600
=1000;

(4)506-298+94
=506+94-298
=600-298
=600-300+2
=300+2
=302;

(5)500-121-79
=500-(121+79)
=500-200
=300;

(6)888-(88+177)
=888-88-177
=800-177
=623.