问题 解答题
用简便方法计算下面各题.
①284+378+122+216②125×5×7×8③82×99
④44×27+27×55+27⑤960÷6÷16⑥1352-(352+365)
⑦14.25+7.3+5.75+2.7           ⑧18.23-6.35-2.65⑨16.78-2.54+3.22-1.46         
⑩26.54-(5.23+6.54)
答案

①284+378+122+216

=(284+216)+(378+122)

=500+500

=1000;

②125×5×7×8

=(125×8)×(5×7)

=1000×35

=35000;

③82×99

=82×(100-1)

=82×100-82×1

=8200-82

=8118;

④44×27+27×55+27

=(44+55+1)×27

=100×27

=2700;

⑤960÷6÷16

=960÷(6×16)

=960÷96

=10;

⑥1352-(352+365)

=1352-352-365

=1000-365

=635;

⑦14.25+7.3+5.75+2.7

=(14.25+5.75)+(7.3+2.7)

=20+10

=30;

⑧18.23-6.35-2.65

=18.23-(6.35+2.65)

=18.23-9

=9.23;

⑨16.78-2.54+3.22-1.46

=(16.78+3.22)-(2.54+1.46)

=20-4

=16;

⑩26.54-(5.23+6.54)

=26.54-5.23-6.54

=26.54-6.54-5.23

=20-5.23

=14.77.

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