题目内容
(1)0.192×12.5+2.67÷
-1.25×3.59
(2)
+
+
+
+
(3)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)
(4)246×321963÷123369+19941994÷19.94
(5)
+
+…+
-
-
-…-
.
| 4 |
| 5 |
(2)
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
(3)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)
(4)246×321963÷123369+19941994÷19.94
(5)
| 1 |
| 55 |
| 2 |
| 55 |
| 10 |
| 55 |
| 11 |
| 155 |
| 12 |
| 155 |
| 20 |
| 155 |
(1)0.192×12.5+2.67÷
-1.25×3.59,
=1.92×1.25+2.67×1.25-1.25×3.59,
=(1.92+2.67-3.59)×1.25,
=1×1.25,
=1.25;
(2)
+
+
+
+
,
=(
-
)+(
-
)+(
-
)+(
-
)+(
-
),
=
-
+
-
+
-
+
-
+
-
,
=
-
,
=
;
(3)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6),
=1÷2×(3÷3)×(4÷4)×(5÷5)×6,
=3;
(4)246×321963÷123369+19941994÷19.94,
=
+1000100,
=642+1000100,
=1000742.
(5)
+
+…+
-
-
-…-
.
=(
)-(
),
=
-
,
=1-1,
=0.
| 4 |
| 5 |
=1.92×1.25+2.67×1.25-1.25×3.59,
=(1.92+2.67-3.59)×1.25,
=1×1.25,
=1.25;
(2)
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=
| 1 |
| 2 |
| 1 |
| 7 |
=
| 5 |
| 14 |
(3)1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6),
=1÷2×(3÷3)×(4÷4)×(5÷5)×6,
=3;
(4)246×321963÷123369+19941994÷19.94,
=
| 123×2×321963 |
| 123×1003 |
=642+1000100,
=1000742.
(5)
| 1 |
| 55 |
| 2 |
| 55 |
| 10 |
| 55 |
| 11 |
| 155 |
| 12 |
| 155 |
| 20 |
| 155 |
=(
| 1+2+3+4+5+6+7+8+9+10 |
| 55 |
| 11+12+13+14+15+16+17+18+19+20 |
| 155 |
=
| 55 |
| 55 |
| 155 |
| 155 |
=1-1,
=0.
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