Question

简便算:4.3*1.65+2.35*4.3 (2)9.9*7.6+99*0.24 (3)1.25*5.6 (4)5.1*

Answer 1

4.3*1.65+2.35*4.3

=4.3x（1.65+2.35）

=4.3x4

=17.2

9.9*7.6+99*0.24

=9.9x7.6+9.9x2.4

=9.9x（7.6+2.4）

=9.9x10

=99

1.25*5.6

=1.25x8x0.7

=1x0.7

=0.7

5.1*19.96-19.96+19.96*5.9

=19.96x（5.1-1+5.9）

=19.96x10

=199.6

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