试题:
计算(能简算的要简算,并写出简算过程).
2
3
+
2
15
)×45
(100-19)÷(1.63+1.07)
18.7-3.375-6.6256+
2
3
÷
1
3
×
3
4

答案:

我来补答
①(
2
3
+
2
15
)×45,
=
2
3
×45+
2
15
×45,
=30+6,
=36;

②(100-19)÷(1.63+1.07),
=81÷2.7,
=30;

③18.7-3.375-6.625,
=18.7-(3.375+6.625),
=18.7-10,
=8.7;

④6+
2
3
÷
1
3
×
3
4

=6+
2
3
×3×
3
4

=6+
3
2

=
15
2
 
 
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