问题 解答题
用递等式计算,能简便的要简便计
69×27+73×6925×(4×12)34×102
400-200÷5×867+99×6742×[169-(78+35)].
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.

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