问题 解答题
脱式计算,能简便计算的要简便计算.
2.5×(1.5+1.5+1.5+1.5)
0.125×32×25
7
9
÷
3
7
+
2
9
×
7
3
答案

(1)2.5×(1.5+1.5+1.5+1.5)

=2.5×(1.5×4)

=(2.5×4)×1.5

=10×15

=15;

(2)0.125×32×25

=0.125×8×4×25

=(0.125×8)×(4×25)

=1×100

=100;

(3)

7
9
÷
3
7
+
2
9
×
7
3

=

7
9
×
7
3
+
2
9
×
7
3

=(

7
9
+
2
9
)×
7
3

=1×

7
3

=

7
3

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