考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:①④⑥根據(jù)四則混合運(yùn)算的運(yùn)算順序計算即可:先算乘除,再算加減,有括號的要先算括號里面的.
②可根據(jù)乘法交換律與結(jié)合律計算.
③可將式中的分?jǐn)?shù)化成小數(shù)后,根據(jù)乘法分配律計算.
⑤可根據(jù)乘法分配律計算括號中的算式.
解答:
解:①14760÷36-24×11
=410-264
=146;
②2.5×8×3.75×0.4
=2.5×0.4×(8×3.75)
=1×30
=30;
③4
×7
+9.4×4.125-4
=4.125×7.6+9.4×4.125-4.125
=4.125×(7.6+9.4-1)
=4.125×16
=66;
④(2
+1
)÷(1-
×
)
=4
÷(1-
)
=
÷=
;
⑤(1
×2.2+2
×1.6)÷6
=(1.6×2.2+2.8×1.6)÷6
=(2.2+2.8)×1.6÷6.4
=5×1.6÷6.4
=8÷6.4
=1.25
⑥[10-12×(0.5+
)]÷4
=[10-12×
]×
=[10-10]×
=0×
=0.
點(diǎn)評:當(dāng)算式中同時含有小括號與中括號時,要先算小括號里面的,再算中括號里面的.