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十個除法算式

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十個除法算式

(1)2.64×1.7-2.64×0.7

=2.64×(1.7-0.7)

=2.64×1

=2.64

(2)31.5×1.07-3.15×0.7

=3.15×10.7-3.15×0.7

=3.15×(10.7-0.7)

=3.15×10

=31.5

(3)2.7×5.7-2.7+5.3×2.7

=2.7×(5.7-1+5.3)

=2.7×10

=27

(4)0.625÷0.125×0.8

=(0.625×0.8)×8÷(0.128×8)

=0.5×8÷1

=4

(5)18.6×6.1+3.9×18.6

=18.6×(6.1+3.9)

=18.6×10

=186

(6)1.3579+3.5791+5.7913+7.9135+9.1357

=(1+3+5+7+9)×1.1111

=25×1.1111

=27.7775

(7)52.5x2.9+5.45

=5.25x29+5.25+0.2

=5.25×(29+1)+0.2

=5.25×30+0.2

=157.5+0.3

=157.7

(8)0.92x15+0.08x15

=(0.92+0.08)×15

=1×15

=15

(9)0.72×1.25×2.5

=0.9×(0.8×1.25)×2.5

=0.9×1×2.5

=2.25

(10)400.6x7-2003x0.4

=200.3x14-200.3x4

=200.3×(14-4)

=200.3×10

=2003

標籤:十個 算式 除法