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.