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`B=-23.(53+18)+53.(18+23)`
`=-23.53-23.18+53.18+53.23`
`=(53.23-23.53)+(53.18-23.18)`
`=18.(53-23)`
`=18.30`
`=540`.
a) \(\text{13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 }\)
\(\text{=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10}\)
\(\text{= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10 }\)
\(\text{= 52 x 58 + 32 x 52 + 52 x 10}\)
\(\text{=52 x ( 58 + 32 + 10 )}\)
\(\text{=52 x 100 = 5200}\)
b) \(\text{14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2}\)
\(\text{= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2 }\)
\(\text{= 70 x 35 + 70 x 25 + 20 x 2 x 70 }\)
\(\text{= 70 x ( 35 + 25 + 40 )}\)
\(\text{= 70 x 100 = 7000 }\)
e) \(\text{5.3.37.4+5.24.21+21.5.12}\)
\(\text{= 5.(3.37.4+24.21+21.12)}\)
\(\text{= 5.1200}\)
\(=6000\)
B= (-23)(53+18) + 53(18+23)
B= (-23).53 + (-23).18 + 53.18 + 53.23
B= 53(23-23) + 18(53-23)
B= 0 + 18.30
B= 540
B = -23 ( 53 + 18 ) + 53 ( 18 + 23 )
= -23 . 53 - 23 . 18 + 53 . 18 + 53 . 23
= ( -23 . 53 + 53 . 23 ) + ( - 23 . 18 + 53 . 18 )
= 0 + 18 ( -23 + 53 )
= 18 . 30 = 540
Vậy B = 540.