题目内容

【题目】脱式计算,能简算的要简算。

3.2×0.25×1.25 2.7×99

3.75×102 8.6×99+8.6

50-1.35-0.65 2.5×4.4

4.5×10.1 2.36×1012.36

(1.25+0.25)×0.4 98×6.5

25×× ÷÷14

÷×9 63×÷

【答案

3.2×0.25×1.25

=(4×0.8×0.25×1.25

=4×0.25×0.8×1.25

=1×1

=1

2.7×99

=2.7×(100-1

=2.7×100-2.7×1

=270-2.7

=267.3

3.75×102

=3.75×100+2

=3.75×100+3.75×2

=375+7.5

=382.5

8.6×99+8.6

=8.6×(99+1

=8.6×100

=860

50-1.35-0.65

=50-(1.35+0.65

=50-2

=48

2.5×4.4

=2.5×(4+0.4

=2.5×4+2.5×0.4

=10+1

=11

4.5×10.1

=4.5×(10+0.1

=4.5×10+4.5×0.1

=45+0.45

=45.45

2.36×1012.36

=2.36×(101-1

=2.36×100

=236

(1.25+0.25)×0.4

=1.5×0.4

=0.6

98×6.5

=100-2×6.5

=100×6.5-2×6.5

=650-13

=637

25××

=25×(×

=25×

=5

÷÷14

=÷(×14)

=÷4

=

÷×9

=×9

=42

63×÷

=28×

=44

【解析】略

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