题目内容
(1)102×1.5-96÷1.6
(2)(
-
×
)÷
(3)2.5×2-4+1.84+5.16
(4)
÷[
-(
-
)].
(2)(
4 |
5 |
1 |
2 |
4 |
5 |
2 |
3 |
(3)2.5×2-4+1.84+5.16
(4)
9 |
32 |
3 |
4 |
7 |
16 |
1 |
4 |
分析:(1)102×1.5-96÷1.6,102×1.5和96÷1.6同时计算,再算减;
(2)先算
×
,再算小括号里的减,最后算括号外面的除;
(3)2.5×2-4+1.84+5.16,先算 2.5×2,再利用加法的结合律变成(5-4)+(1.84+5.16 )计算简便;
(4)根据四则运算的顺序先算小括号里,再算中括号里,最后算括号外面的.
(2)先算
1 |
2 |
4 |
5 |
(3)2.5×2-4+1.84+5.16,先算 2.5×2,再利用加法的结合律变成(5-4)+(1.84+5.16 )计算简便;
(4)根据四则运算的顺序先算小括号里,再算中括号里,最后算括号外面的.
解答:解:(1)102×1.5-96÷1.6,
=153-60,
=93;
(2)(
-
×
)÷
,
=(
-
)×
,
=
×
,
=
;
(3)2.5×2-4+1.84+5.16,
=(5-4)+(1.84+5.16 ),
=1+7,
=8;
(4)
÷[
-(
-
)],
=
÷[
-
],
=
×
,
=
.
=153-60,
=93;
(2)(
4 |
5 |
1 |
2 |
4 |
5 |
2 |
3 |
=(
4 |
5 |
2 |
5 |
3 |
2 |
=
2 |
5 |
3 |
2 |
=
3 |
5 |
(3)2.5×2-4+1.84+5.16,
=(5-4)+(1.84+5.16 ),
=1+7,
=8;
(4)
9 |
32 |
3 |
4 |
7 |
16 |
1 |
4 |
=
9 |
32 |
3 |
4 |
3 |
16 |
=
9 |
32 |
16 |
9 |
=
1 |
2 |
点评: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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