(mik thấy nó cũng dễ mè ) :3
a) (4 + 32 + 6) + (10 – 32 – 2)
= (36 + 6) + (-22 – 2)
= 42 + (-24) = 42 – 24 = 18
b) 300:4 + 300:6 – 25
= 75 + 50 – 25 = 125 – 25 = 100
c) 17.[29 – (-111)] + 29.(-17)
= 17.(29 + 111) – 29.17
= 17.29 + 17.111 – 29.17
= (17.29 – 29.17) + 17.111
= 0 + 1887 = 1887
d) 19.43 + (-20).43 – (-40)
= 19.43 – 20.43 + 40
= 43(19 – 20) + 40
= 43.(-1) + 40
= -43 + 40 = -3
a) (4 + 32 + 6) + (10 – 32 – 2) = 42 + -24 = 18
b) 300:4 + 300:6 – 25 = 75 + 50 - 25 = 100
c) 17.[29 – (-111)] + 29.(-17) = 17.140 + -29.17 = 17.(140 + -29) = 17.111 = 1887
d) 19.43 + (-20).43 – (-40) = 43.(19 + -20) - -40 = 43.-1 + 40 = -43 + 40 = -3
\(a) (4 + 32 + 6) + (10 – 32 – 2)\)
\(= 4 + 32 + 6 + 10 − 32 − 2\)
\(= ( 4 + 6 ) + ( 32 − 32 ) + ( 10 − 2 )\)
\(= 10 + 0 + 8 = 18\)
\(b) 300:4 + 300:6 – 25\)
\(= 75 + 50 − 25\)
\(=\)\( ( 75 − 25 ) + 50\)
\(= 50 + 50 = 100\)
\(c) 17.[29 – (-111)] + 29.(-17)\)
\(=\)\( 17 . ( 29 + 111 ) − 29 . 17\)
\(= 17 . ( 29 − 29 + 111 )\)
\(= 17 . 111 = 1887\)
\(d) 19.43 + (-20).43 – (-40)\)
\(=\)\( 19 . 43 − 20 . 43 + 40\)
\(= 43 . ( 19 − 20 ) + 40\)
\(= 43 . ( − 1 ) + 40\)
\(\text{= − 43 + 40 = − 3}\)
