题目内容
| 计算下面各题,能简算的要简算. (1)(
| (2)
| (3)
| ||||||||||||||||||
| (4)2.5×97×0.4 | (5)1.25×97×8 | (6)1.25×32×2.5×97 | ||||||||||||||||||
| (7)0.36×101 | (8)0.36×98 | (9)
| ||||||||||||||||||
(10)
| (11)
| (12)
| ||||||||||||||||||
(13)90×
| (14)86×
| (15)
| ||||||||||||||||||
| (16)0.36×101-0.36 | (17)0.36×99+0.36 | (18)
|
(1)(
+
)×15,
=
×15+
×15,
=3+5,
=8;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
×
×
,
=
×
×
,
=
×
,
=
;
(4)2.5×97×0.4,
=(2.5×0.4)×97,
=1×97,
=97;
(5)1.25×97×8,
=(1.25×8)×97,
=10×97,
=970;
(6)1.25×32×2.5×97,
=1.25×8×4×2.5×97,
=(1.25×8)×(4×2.5)×97,
=10×10×97,
=9700;
(7)0.36×101,
=0.36×(100+1),
=0.36×100+0.36×1,
=36+0.36,
=36.36;
(8)0.36×98,
=0.36×(100-2),
=0.36×100-0.36×2,
=36-0.72,
=35.28;
(9)
-
×
,
=(1-
)×
,
=
×
,
=
;
(10)
+
×
,
=(1+
)×
,
=
×
,
=
;
(11)
+
×
,
=
+
,
=
;
(12)
-
×
,
=(1-
)×
,
=
×
,
=
;
(13)90×
,
=(91-1)×
,
=91×
-1×
,
=4-
,
=3
;
(14)86×
,
=(91-5)×
,
=91×
-5×
,
=2-
,
=1
;
(15)
×
-
×
,
=(
-
)×
,
=1×
,
=
;
(16)0.36×101-0.36,
=0.36×(101-1);
=0.36×100,
=36;
(17)0.36×99+0.36,
=0.36×(99+1),
=0.36×100,
=36;
(18)
×
-
,
=
-
,
=
.
| 1 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 3 |
=3+5,
=8;
(2)
| 4 |
| 7 |
| 5 |
| 9 |
| 3 |
| 7 |
| 5 |
| 9 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 9 |
=1×
| 5 |
| 9 |
=
| 5 |
| 9 |
(3)
| 1 |
| 3 |
| 5 |
| 16 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 3 |
| 5 |
| 5 |
| 16 |
=
| 1 |
| 5 |
| 5 |
| 16 |
=
| 1 |
| 16 |
(4)2.5×97×0.4,
=(2.5×0.4)×97,
=1×97,
=97;
(5)1.25×97×8,
=(1.25×8)×97,
=10×97,
=970;
(6)1.25×32×2.5×97,
=1.25×8×4×2.5×97,
=(1.25×8)×(4×2.5)×97,
=10×10×97,
=9700;
(7)0.36×101,
=0.36×(100+1),
=0.36×100+0.36×1,
=36+0.36,
=36.36;
(8)0.36×98,
=0.36×(100-2),
=0.36×100-0.36×2,
=36-0.72,
=35.28;
(9)
| 5 |
| 7 |
| 5 |
| 9 |
| 5 |
| 7 |
=(1-
| 5 |
| 9 |
| 5 |
| 7 |
=
| 4 |
| 9 |
| 5 |
| 7 |
=
| 20 |
| 63 |
(10)
| 2 |
| 9 |
| 7 |
| 16 |
| 2 |
| 9 |
=(1+
| 7 |
| 16 |
| 2 |
| 9 |
=
| 23 |
| 16 |
| 2 |
| 9 |
=
| 23 |
| 72 |
(11)
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 7 |
=
| 1 |
| 4 |
| 3 |
| 14 |
=
| 13 |
| 28 |
(12)
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 8 |
=(1-
| 3 |
| 8 |
| 2 |
| 5 |
=
| 5 |
| 8 |
| 2 |
| 5 |
=
| 1 |
| 4 |
(13)90×
| 4 |
| 91 |
=(91-1)×
| 4 |
| 91 |
=91×
| 4 |
| 91 |
| 4 |
| 91 |
=4-
| 4 |
| 91 |
=3
| 87 |
| 91 |
(14)86×
| 2 |
| 91 |
=(91-5)×
| 2 |
| 91 |
=91×
| 2 |
| 91 |
| 2 |
| 91 |
=2-
| 10 |
| 91 |
=1
| 81 |
| 91 |
(15)
| 7 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 3 |
=(
| 7 |
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
=1×
| 2 |
| 3 |
=
| 2 |
| 3 |
(16)0.36×101-0.36,
=0.36×(101-1);
=0.36×100,
=36;
(17)0.36×99+0.36,
=0.36×(99+1),
=0.36×100,
=36;
(18)
| 13 |
| 20 |
| 15 |
| 26 |
| 2 |
| 9 |
=
| 3 |
| 8 |
| 2 |
| 9 |
=
| 11 |
| 72 |
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