问题
解答题
用简便方法计算下面各题.
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答案
(1)8709-1473-295-527-391-105-409,
=8709-(1473+295+527+391+105+409),
=8709-[(1473+527)+(295+105)+(391+409)],
=8709-[2000+400+800],
=8709-3200,
=5509;
(2)756+478+2346+(356+178)-146,
=750+6+450+28+2346+350+6+150+28-146,
=(750+350)+(450+150)+(2346-146)+(6+6+28)+28,
=1100+600+2200+40+28,
=3900+40+68,
=3968;
(3)625×36×40×125,
=625×18×2×40×125,
=(625×18)×(2×40×125),
=11250×10000,
=112500000;
(4)33333×33334=1111122222.