
简便运算.(13+16+19)÷1181.875÷2.5?3
简便运算.(13+16+19)÷1181.875÷2.5?38×0.4125×3.2×2.50.9+99×0.9....
简便运算.(13+16+19)÷1181.875÷2.5?38×0.4125×3.2×2.50.9+99×0.9.
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(1)(
+
+
)÷
,
=(
+
+
)×18,
=
×18+
×18+
×18,
=6+3+2,
=11;
(2)1.875÷2.5-
×0.4,
=0.75-
,
=0.75-0.15,
=0.6;
(3)125×3.2×2.5,
=125×8×0.4×2.5,
=(125×8)×(0.4×2.5),
=1000×1,
=1000;
(4)0.9+99×0.9,
=(1+99)×0.9,
=100×0.9,
=90.
1 |
3 |
1 |
6 |
1 |
9 |
1 |
18 |
=(
1 |
3 |
1 |
6 |
1 |
9 |
=
1 |
3 |
1 |
6 |
1 |
9 |
=6+3+2,
=11;
(2)1.875÷2.5-
3 |
8 |
=0.75-
3 |
20 |
=0.75-0.15,
=0.6;
(3)125×3.2×2.5,
=125×8×0.4×2.5,
=(125×8)×(0.4×2.5),
=1000×1,
=1000;
(4)0.9+99×0.9,
=(1+99)×0.9,
=100×0.9,
=90.
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