问题 解答题

用递等式计算,能巧算的要巧算.

529+736+471

915+782-315

83×501+73

(1237+2331÷37)÷20.

答案

(1)529+736+471,

=(529+471)+736,

=1000+736,

=1736;

(2)915+782-315,

=(915-315)+782,

=600+782,

=1382;

(3)83×501+73,

=83×(500+1)+73,

=83×500+83+73,

=(80+3)×500+(83+73),

=80×500+3×500+156,

=40000+1500+156,

=41656;

(4)(1237+2331÷37)÷20,

=(1237+63)÷20,

=1300÷20,

=65.

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