在先算的那一步下面畫上直線,如:(12-5)×4,再計算.
84×2×4
=
=
107×3×2
=
=
260+19×4
=
=
6×(87+33)
=
=
(650-308)×4
=
=
936-36×8
=
=
分析:(1)(2)按照從左到右的順序計算即可;
(3)先算乘法,再算加法;
(4)先算小括號里面的加法,再算乘法;
(5)先算小括號里面的減法,再算乘法;
(6)先算乘法,再算減法.
解答:解:(1)

=168×4
=672;
(2)

=321×2
=642;
(3)

=260+76
=336;
(4)

=6×120
=720;
(5)

=342×4
=1368;
(6)

=936-288
=648.
點評:計算關鍵是確定運算順序,進一步根據(jù)數(shù)字特點和運算符號選擇合理的計算方法計算即可.
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