0.79 x 0.46+7.9x 0.24+ 1 1.4x 0.079

= 0.79 x 0.46+0.79 x 2.4+ 1. 14x 0.79

= 0.79 x(0.46+2.4+ 1. 14)

=0.79X4

=3. 16

2 、

B is 10 times that of a.

b:7.02/( 1- 1/ 10)= 7.02/9/ 10 = 7.8。

A: 0.78

3 、

0.9999 x 0.7+0. 1 1 1 1x 2.7

= 0. 1 1 1 1x9x 0.7+0. 1 1 1 1x 2.7

= 0. 1 1 1 1X(6.3+2.7)

= 0. 1 1 1 1x 9

=0.9999

This question is not very clear. Let's see if this is feasible (loop in brackets):

0. 1(99)6 >0. 1(996)>0. 19(96)>0.( 199)6

5、

199. 199× 198- 198. 198× 199

= 199. 199× 198- 198. 198× 198 - 198. 198

= 198× 1.00 1- 198. 198

=0

It's best to think for yourself, the topics are all of the same type.