a) 43 x 27 + 43 x 13 + 43 x 68
= 43 x ( 27 + 13 + 68 )
= 43 x 108
= 43 x ( 100 + 8 )
= 43 x 100 + 43 x 8
= 4300 + 344
= 4644
b) 90 x 21 + 15 x 10 + 30 x 74
= 30 x 63 + 30 x 5 + 30 x 74
= 30 x ( 63 + 5 + 74 )
= 30 x 142
= 30 x ( 100 + 42 )
= 30 x 100 + 30 x 42
= 3000 + 1260
= 4260
a, 43x27+43x13+43x68
=43x(27+13+68)
=43x108
= 4644
b, 90x21+15x10+30x74
=9x10x21+15x10+3x10x74
=10x189+10x15+10x222
=10x(189+222+15)
=10x426
= 4260
Giải
a)43x27+43x13+43x68
=43(27+13+68)
=43x108
=43x100+43x8
=4300+344
=4644
b)90x21+15x10+30x74
=30x63+30x5+30x74
=30(63+5+74)
=30.142
=4260
a, 43 . 27 + 43 . 13 + 43 . 68
= 43 . ( 27 + 13 + 68 )
= 43 . 108
= 4644
b, 90 . 21 + 15 . 10 + 30 . 74
90 . 21 + 15 . 6 . 10 + 30 . 3 . 74
90 . 21 + 90 . 10 + 90 . 74
= 90 . ( 21 + 10 + 74 )
= 90 . 105
= 9450
Chúc bn học tốt !
a)43x(27+13+68)
=43x108
=4644
b)9x10x21+15x10+3x10x74
=10(9x21+15+3x74)
=10x426
=4260
tk mk nhoaa
a) 43 x 27 + 43 x 13 + 43 x 68
= 43 x ( 27 + 13 + 68 )
= 43 x 108 = 1044
b) 90 x 21 + 15 x 10 + 30 x 74
= 15 x 2 x 3 x 21 +15 x 2 x 5 + 15 x 2 x 37
= 30 x ( 63 + 5 + 37 )
= 30 x 143
= 4290
a, 43 x 27 + 43 x 13 + 43 x 68
= 43 x ( 27 + 13 + 68 )
= 43 x 108
= 4644
b, 90 x 21 + 15 x 10 + 30 x 74
= 1890 + 150 + 2220
= 2040 + 2220
= 4260
