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\(76.\left(-42\right)+76.\left(-14\right)+24.\left(-56\right)\)
\(=76.\left(-42+-14\right)+24.\left(-56\right)\)
\(=76.\left(-56\right)+24.\left(-56\right)\)
\(=\left(76+24\right).-56\)
\(=100.-56\)
\(=-5600\)
\(a,30\cdot6+30\cdot71+20\cdot30\)
=\(30\cdot\left(6+71+20\right)\)
=\(30\cdot97=2910\)
\(b,24\cdot\left(31+119\right)+76\cdot\left(29+121\right)\)
=\(24\cdot150+76\cdot150\)
=\(150\cdot\left(24+76\right)\)
=\(150\cdot100\)
=\(15000\)
\(c,87\cdot23+70\cdot87+43\cdot93\)
=\(87\cdot\left(23+87\right)+43\cdot93\)
=\(87\cdot110+3999\)
=\(9570+3999\)
=13569
a) 15 . 6 . 2 + 3 . 71 . 10 + 20 . 30
= ( 15 . 2 ) . 6 + ( 3 . 10 ) . 71 + 20 . 30
= 30 . 6 + 30 . 71 + 20 . 30
= 30 . ( 6 + 71 + 30 )
= 30 . 107
= 3210
b) 24 . 31 + 24 . 119 + 76 . 29 + 76 . 121
= 24 . ( 31 + 119 ) + 76 . ( 29 + 121 )
= 24 . 150 + 76 . 150
= 150 . ( 24 + 76 )
= 150 . 100
= 15 000
c) 87 . 23 + 43 . 93 + 70 . 87
= 87 . 23 + 70 . 87 + 43 . 93
= 87 . ( 23 + 70 ) + 43 . 93
= 87 . 93 + 43 . 93
= 93 . ( 87 + 43 )
= 93 . 130
= 12 090
a,= 32.(11+67) +78.68
32.78+78.68
78.(32+68)
78.100
= 7800
b,76.(41-20)+21.24
=76.21+21.24
=21.(76+24)
=21.100
=2100
24 + 5x = 76 : 74
=> 24 + 5x = 38/37
=> 5x = 38/37 - 24
=> 5x = -850/37
=> x = -850/37 : 5
=> -170/37
4 x 7 x 76 + 28 x 24
= 28 x 76 + 28 x 24
= 28 x (76 + 24)
= 28 x 100
= 2800
\(4.7.76+28.24\)
\(=28.76+28.24\)
\(=28.\left(76+24\right)\)
\(=28.100\)
\(=2800\)
-100
-100