a,42 + 37 + 135 +58 +63
= ( 42 + 58 ) + ( 37 + 63 ) + 135
= 100 + 100 + 135
= 335
b,25.17.8.4.125
= ( 25 . 4 ) . ( 125 . 8 ) . 17
= 100 . 1000 . 17
= 100000 . 17
= 1700000
c,43.27+93.43 +57.61+59.57
= 43 . ( 27 + 93 ) + 57 . ( 61 + 59 )
= 43 . 120 + 57 . 120
= 120 . ( 43 + 57 )
= 120 . 100
= 12000
d,64.6+81.4+17.6
= 6 . ( 64 + 17 ) + 81 . 4
= 6 . 81 + 81 . 4
= 81 . ( 6 + 4 )
= 81 . 10
= 810
\(a.=\left(42+58\right)+\left(37+63\right)+135\)
\(=100+100+135=335\)
\(b.=\left(25.4\right).\left(125.8\right).17\)
\(=100.1000.17=1700000\)
\(c.=\left[43.\left(27+93\right)\right]+\left[57.\left(61+57\right)\right]\)
\(=43.120+57.120=120.\left(43+57\right)=120.100=12000\)
\(d.=64.6+54.6+17.6\)
\(=6.\left(54+64+17\right)=6.135=810\)
`a)42 + 37 + 135 +58 +63`
`= (42 + 58)+(37+63)+135`
`=100+100+135`
`=200+135`
`=335`
_______________________
`b)25 xx 17 xx 8 xx 4 xx 125`
`= ( 125 xx 8 ) xx ( 25 xx 4 ) xx 17`
`= 1000 xx 100 xx 17`
`= 100` `000` `xx` `17`
`= 1` `700` `000`
`c) 43 xx 27+93xx43 +57 xx 61+59 xx 57`
`= 43 xx ( 27 + 93 ) + 57 xx ( 61 + 59 )`
`= 43 xx 120 + 57 xx 120`
`= 120 xx ( 43 + 57 )`
`= 120 xx 100`
`= 12` `000`
_________________________________
`d) 64xx6+81xx4+17xx6`
`=6 xx ( 64 + 17 ) + 81 xx 4`
`= 6 xx 81 + 81 xx 4`
`= 81 xx ( 6 + 4 )`
`= 81 xx10 = 810`
