考點(diǎn):整數(shù)四則混合運(yùn)算,分?jǐn)?shù)的簡(jiǎn)便計(jì)算,小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)先算除法,再算乘法,最后算減法;
(2)同一級(jí)運(yùn)算,改變運(yùn)算順序簡(jiǎn)算;
(3)改變運(yùn)算順序,利用除法的性質(zhì)簡(jiǎn)算;
(4)(5)利用乘法分配律簡(jiǎn)算;
(6)先算乘法,再算除法,最后算減法.
解答:
解:(1)3708-3636÷36×18
=3708-101×18
=3708-1818
=1890;
(2)11.94+9.56-3.56
=11.9+(9.56-3.56)
=11.9+6
=17.9;
(3)13÷14÷52×56
=56÷14÷(52÷13)
=4÷4
=1;
(4)1.8×1.25-1.25
=(1.8-1)×1.25
=0.8×1.25
=1;
(5)7÷
-5÷6
=7×
-
=(7-1)×
=6×
=5;
(6)
×9.9÷
-
=9×
-
=
-
=0.
點(diǎn)評(píng):混合運(yùn)算的關(guān)鍵是抓住運(yùn)算順序,正確按運(yùn)算順序計(jì)算,適當(dāng)利用運(yùn)算定律簡(jiǎn)算.