问题
解答题
用递等式计算,能简便的要简便计
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答案
(1)69×27+73×69
=(27+73)×69
=100×69
=6900;
(2)25×(4×12)
=25×4×12
=100×12
=1200;
(3)34×102
=34×100+34×2
=3400+68
=3468;
(4)400-200÷5×8
=400-40×8
=400-320
=80;
(5)67+99×67
=(1+99)×67
=100×67
=6700;
(6)42×[169-(78+35)]
=42×[169-113]
=42×56
=2352.