A-A+
简便方法计算 写出主要计算过程.(1)6.12+37+2.88+47(2)2924-(524
问题详情
(1)6.12+
参考答案
(1)6.12+37+2.88+47,
=(6.12+2.88)+(37+47),
=9+1,
=10;
(2)2924-(524-49),
=2924-524+49,
=2424+49,
=149;
(3)1811-(711+38),
=1811-711-38,
=1111-38,
=1-38,
=58;
(4)79+310-29+1710,
=(79-29)+(310+1710),
=59+2010,
=259;
(5)715+712+815-712,
=(715+815)+(712-712),
=1515+0,
=1;
(6)1511-38-58,
=1511-(38+58),
=1511-1,
=411.
考点:过程,方法