用简便方法计算下面各题.13.2-3.7-6.3 10.26-(3.78+4.26) (712+38)×24 101×7.815×24+176×2

2024-12-04 15:19:44
推荐回答(1个)
回答1:

(1)13.2-3.7-6.3,
=13.2-(3.7+6.3),
=13.2-10,
=3.2;

(2)10.26-(3.78+4.26),
=10.26-3.78-4.26,
=(10.26-4.26)-3.78,
=6-3.78,
=2.22;

(3)(

7
12
+
3
8
)×24,
=
7
12
×24+
3
8
×24,
=14+9,
=23;

(4)101×7.8,
=(100+1)×7.8,
=100×7.8+1×7.8,
=780+7.8,
=787.8;

(5)
1
5
×24+176×20%,
=0.2×24+176×0.2,
=0.2×(24+176),
=0.2×200,
=40;

(6)32×12.5×O.25,
=4×8×12.5×O.25,
=(4×O.25)×(8×12.5),
=1×100,
=100;

(7)8.6×
2
3
+8.6÷3,
=8.6×
2
3
+8.6×
1
3

=8.6×(
2
3
+
1
3
),
=8.6×1,
=8.6;

(8)700÷12.5÷8,
=700÷(12.5×8),
=700÷100,
=7.