Toán Lớp 6: TÍNH NHANH
A= (-135) x 29 – 13 x 135 + 42 x (-65)
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Toán Lớp 6: TÍNH NHANH
A= (-135) x 29 – 13 x 135 + 42 x (-65)
Comments ( 2 )
A = ( -135 ) xx 29 – 13 xx 135 + 42 xx ( -65 )
A = 135 xx ( -29 ) – 13 xx 135 + 42 xx ( -65 )
A = 135 xx ( -29 – 13 ) + 42 xx ( -65 )
A = 135 xx ( -42 ) + ( -42 ) xx 65
A = ( -42 ) xx ( 135 + 65 )
A = ( -42 ) xx 200
A = -8400
Giải đáp:
A = (-135) xx 29 – 13 xx 135 + 42 xx (-65)
= (-135) xx ( 29 + 13) + 42 xx (-65)
= (-135) xx 42 + 42 xx (-65)
= 42 xx ( -135 – 65 )
= 42 xx (-200)
= -8400