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直接写数对又快1÷23×32

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直接写数对又快
2
3
×
3
2
直接写数对又快1÷23×32
(1)1÷
2

3
2,
=
3

3
2,
=
9
4;
(2)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(3)112×(24−4
4
5)÷2.4,
=112×
96

5
12,
=112×(
96

5
12),
=112×8,
=896;
(4)6
7
10×121+444÷
40
99+67×21.2,
=6.7×121+67×21.2+444×
99
40,
=67×12.1+67×21.2+444×
99
40,
=67×(12.1+21.2)+11.1×99,
=67×33.3+33.3×33,
=(67+33)×33.3,
=100×33.3,
=3330;
(5)13
4
19+86
15
19×0.25+0.625×86
15
19+0.125×86
15
19,
=13
4
19+(0.25+0.625+0.125)×86
15
19,
=13
4
19+1×86
15
19,
=13
4
19+86
15
19,
=100.