A-A+
用递等式计算 能简算的要简算(1)(512+19+38)×72(2)(2-34×45)÷(1
问题详情
(1)(
(2)(2-
参考答案
解(1)(512+19+38)×72,
=72×512+72×19+38×72,
=30+8+27,
=65;
(2)(2-34×45)÷(112+415),
=(2-35)÷(560+1660),
=75×6021,
=4;
(3)525-(156+3310),
=51230-(12530+3930),
=44230-43430,
=415;
(4)[(213+4.8÷135)-416]×112,
=[(213+3)-416]×32,
=[526-416]×32,
=76×32,
=134.
考点:等式