题目内容

能简算的要简算
1.2-0.5×1.8÷0.9
3
5
×8.8+0.6×
1
5
+60%
8×7×1.25 (
3
8
-
3
8
÷
8
3
16
9
分析:(1)先算乘法,再算除法,最后算减法;
(2)根据乘法分配律进行计算;
(3)根据乘法交换律进行计算;
(4)先算乘法,再算减法,最后算乘法.
解答:解:
(1)1.2-0.5×1.8÷0.9,
=1.2-0.9÷0.9,
=1.2-1,
=0.2;

(2)
3
5
×8.8+0.6×
1
5
+60%,
=0.6×8.8+0.6×0.2+0.6,
=0.6×(8.8+0.2+1),
=0.6×10,
=6;

(3)8×7×1.25,
=8×1.25×7,
=10×7,
=70;

(4)(
3
8
-
3
8
÷
8
3
16
9

=(
3
8
-
9
64
)×
16
9

=
15
64
×
16
9

=
5
12
点评:四则运算,先弄清运算顺序,然后再进行计算,能简算的要简算.
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