Toán Lớp 6: 87.(-129)+129.(-13)
116.(-991).0.231
(-1476).(-312)+1476.(-12)
13-18-(-42)-15
em đang cần gấp
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Toán Lớp 6: 87.(-129)+129.(-13)
116.(-991).0.231
(-1476).(-312)+1476.(-12)
13-18-(-42)-15
em đang cần gấp
Comments ( 2 )
= ( -87 ). 129 + 129. (-13)
= 129. [ ( -87 ) + ( -13 ) ]
= 129. [ -87 – 13 ]
= 129. ( -100 )
= -12900
_____________________
116. ( -991 ). 0. 231
= 0. 231
= 0
____________________
( -1476 ) . ( -312 ) + 1476. ( -12 )
= 1476 . 312 + 1476. ( -12 )
= 1476. [ 312 + ( -12 ) ]
= 1476. [ 312 – 12 ]
= 1476. 300
= 442800
_____________________
13 – 18 – ( -42 ) – 15
= -5 – ( -42 ) – 15
= -5 + 42 – 15
= ( -5 – 15 ) + 42
= ( -20 ) + 42
= 22