在先算的那一步下面畫(huà)上直線,如:(12-5)×4,再計(jì)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(jì)算即可;
(3)先算乘法,再算加法;
(4)先算小括號(hào)里面的加法,再算乘法;
(5)先算小括號(hào)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(diǎn)評(píng):計(jì)算關(guān)鍵是確定運(yùn)算順序,進(jìn)一步根據(jù)數(shù)字特點(diǎn)和運(yùn)算符號(hào)選擇合理的計(jì)算方法計(jì)算即可.
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