题目内容
(1)15
÷14=
(2)8
-(
+6
)=
(3)31.4+15.19+20.6+32.81=
(4)9
-3
+2
-8
=
(5)44
-23
-23
+44
=
(6)(1
+2
+3
+1
)÷5=
(7)9+19+199+1999=
(8)0.9+0.99+0.999+0.111=
| 1 |
| 13 |
(2)8
| 6 |
| 7 |
| 23 |
| 45 |
| 6 |
| 7 |
(3)31.4+15.19+20.6+32.81=
(4)9
| 5 |
| 7 |
| 4 |
| 9 |
| 4 |
| 9 |
| 2 |
| 7 |
(5)44
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 2 |
| 3 |
(6)(1
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
(7)9+19+199+1999=
(8)0.9+0.99+0.999+0.111=
(1)15
| 1 |
| 13 |
=(14+1
| 1 |
| 13 |
| 1 |
| 14 |
=14×
| 1 |
| 14 |
| 1 |
| 13 |
| 1 |
| 14 |
=1+
| 1 |
| 13 |
=1
| 1 |
| 13 |
(2)8
| 6 |
| 7 |
| 23 |
| 45 |
| 6 |
| 7 |
=8
| 6 |
| 7 |
| 23 |
| 45 |
| 6 |
| 7 |
=8
| 6 |
| 7 |
| 6 |
| 7 |
| 23 |
| 45 |
=2-
| 23 |
| 45 |
=1
| 22 |
| 45 |
(3)31.4+15.19+20.6+32.81,
=(31.4+20.6)+(15.19+32.81),
=52+48,
=100;
(4)9
| 5 |
| 7 |
| 4 |
| 9 |
| 4 |
| 9 |
| 2 |
| 7 |
=(9
| 5 |
| 7 |
| 2 |
| 7 |
| 4 |
| 9 |
| 4 |
| 9 |
=1
| 3 |
| 7 |
=
| 3 |
| 7 |
(5)44
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 2 |
| 3 |
=(44
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
=89-46
| 2 |
| 5 |
=42
| 3 |
| 5 |
(6)(1
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
=[(1
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
=[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.
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