A-A+
(1)15113÷14=(2)867-(2345+667)=(3)31.4+15.19+20
问题详情
(1)15
(2)8
(3)31.4+15.19+20.6+32.81=
(4)9
(5)44
(6)(1
(7)9+19+199+1999=
(8)0.9+0.99+0.999+0.111=
参考答案
(1)15113÷14,
=(14+1113)×114,
=14×114+1113×114,
=1+113,
=1113;
(2)867-(2345+667),
=867-2345-667,
=867-667-2345,
=2-2345,
=12245;
(3)31.4+15.19+20.6+32.81,
=(31.4+20.6)+(15.19+32.81),
=52+48,
=100;
(4)957-349+249-827,
=(957-827)-(349-249),
=137-1,
=37;
(5)4413-2315-2315+4423,
=(4413+4423)-(2315+2315),
=89-4625,
=4235;
(6)(134+223+314+113)÷5,
=[(134+314)+(223+113)]÷5,
=[5+4]÷5,
=9÷5,
=1.8;
(7)9+19+199+1999,
=(1+1+1+6)+19+199+1999,
=(1+19)+(1+199)+(1+1999)+6,
=20+200+2000+6,
=2220+6,
=2226;
(8)0.9+0.99+0.999+0.111,
=0.9+0.99+0.999+(0.1+0.01+0.001),
=(0.9+0.1)+(0.99+0.01)+(0.999+0.001),
=1+1+1,
=3.
考点: