题目内容

神机妙算细又巧!(能简算的要写出简算过程)
4×0.8×2.5×12.5 2.3×85+2.3×1536.5×99+36.5
0.65×14+87×65%-
13
20
2
3
-
1
2
+
1
6
)÷
1
24
①4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;

②2.3×85+2.3×15,
=2.3×(85+15),
=2.3×100,
=230;

③36.5×99+36.5,
=36.5×(99+1),
=36.5×100,
=3650;

④0.65×14+87×65%-
13
20

=0.65×(14+87-1),
=0.65×100,
=65;

⑤(
2
3
-
1
2
+
1
6
)÷
1
24

=(
2
3
-
1
2
+
1
6
)×24,
=
2
3
×24-
1
2
×24+
1
6
×24,
=16-12+4,
=8.
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