题目内容
能简算的要简算
1.2-0.5×1.8÷0.9 | ![]() ![]() | 8×7×1.25 | ![]() |
解:
(1)1.2-0.5×1.8÷0.9,
=1.2-0.9÷0.9,
=1.2-1,
=0.2;
(2)
×8.8+0.6×
+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)
,
=(
-
)×
,
=
×
,
=
.
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.
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.
(1)1.2-0.5×1.8÷0.9,
=1.2-0.9÷0.9,
=1.2-1,
=0.2;
(2)


=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)

=(



=


=

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.
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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