题目内容
计算下列各题,能简算的要简算.
(1).1.5×8.4+3×
+15×l0%;
(2)
+(1-
×
);
(3)(
+
×
)÷
;
(4)[
-(
-
)]÷
;
(5)1110÷[11×(
-
)×13];
(6)5-[1
-(2.5-1
)]÷0.125.
(1).1.5×8.4+3×
| 3 |
| 10 |
(2)
| 1 |
| 2 |
| 7 |
| 12 |
| 8 |
| 7 |
(3)(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 8 |
| 1 |
| 5 |
(4)[
| 8 |
| 13 |
| 8 |
| 9 |
| 5 |
| 13 |
| 10 |
| 81 |
(5)1110÷[11×(
| 5 |
| 11 |
| 5 |
| 13 |
(6)5-[1
| 1 |
| 3 |
| 2 |
| 3 |
分析:(1)根据乘法分配律进行计算;
(2)先算乘法,再算减法,最后算加法;
(3)根据乘法分配律进行计算;
(4)根据连减的性质计算括号里面的,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据连减的性质计算括号里面的,再算除法,最后算减法.
(2)先算乘法,再算减法,最后算加法;
(3)根据乘法分配律进行计算;
(4)根据连减的性质计算括号里面的,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据连减的性质计算括号里面的,再算除法,最后算减法.
解答:解:
(1)1.5×8.4+3×
+15×l0%,
=1.5×8.4+1.5×0.l+3×
,
=1.5×(8.4+0.1)+0.9,
=1.5×8.5+0.9,
=12.75+0.9,
=13.65;
(2)
+(1-
×
),
=
+(1-
),
=
+
,
=
;
(3)(
+
×
)÷
,
=(
+
×
)×5,
=
×5+
×
×5,
=1+
,
=1
;
(4)[
-(
-
)]÷
,
=[
-
+
]÷
,
=[1-
]÷
,
=
÷
,
=
;
(5)1110÷[11×(
-
)×13],
=1110÷[11×
×13-11×
×13],
=1110÷[65-55],
=1110÷10,
=111;
(6)5-[1
-(2.5-1
)]÷0.125,
=5-[1
-2.5+1
]÷0.125,
=5-[3-2.5]÷0.125,
=5-0.5÷0.125,
=5-4,
=1.
(1)1.5×8.4+3×
| 3 |
| 10 |
=1.5×8.4+1.5×0.l+3×
| 3 |
| 10 |
=1.5×(8.4+0.1)+0.9,
=1.5×8.5+0.9,
=12.75+0.9,
=13.65;
(2)
| 1 |
| 2 |
| 7 |
| 12 |
| 8 |
| 7 |
=
| 1 |
| 2 |
| 2 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 3 |
=
| 5 |
| 6 |
(3)(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 8 |
| 1 |
| 5 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 8 |
=
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 8 |
=1+
| 1 |
| 2 |
=1
| 1 |
| 2 |
(4)[
| 8 |
| 13 |
| 8 |
| 9 |
| 5 |
| 13 |
| 10 |
| 81 |
=[
| 8 |
| 13 |
| 8 |
| 9 |
| 5 |
| 13 |
| 10 |
| 81 |
=[1-
| 8 |
| 9 |
| 10 |
| 81 |
=
| 1 |
| 9 |
| 10 |
| 81 |
=
| 9 |
| 10 |
(5)1110÷[11×(
| 5 |
| 11 |
| 5 |
| 13 |
=1110÷[11×
| 5 |
| 11 |
| 5 |
| 13 |
=1110÷[65-55],
=1110÷10,
=111;
(6)5-[1
| 1 |
| 3 |
| 2 |
| 3 |
=5-[1
| 1 |
| 3 |
| 2 |
| 3 |
=5-[3-2.5]÷0.125,
=5-0.5÷0.125,
=5-4,
=1.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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