考點(diǎn):小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:①先算小括號(hào)里的,再算括號(hào)外的除法,最后算減法;
②先算小括號(hào)里的,再算中括號(hào)里的,最后算括號(hào)外的乘法;
③先算小括號(hào)里的加法,再算中括號(hào)里的減法,最后算括號(hào)外的除法;
④先根據(jù)乘法分配律求出小括號(hào)里的,再算括號(hào)外的除法;
⑤先算二級(jí)運(yùn)算,再算一級(jí)運(yùn)算;
⑥先把5.54×6轉(zhuǎn)化為55.4×0.6,然后根據(jù)乘法分配律進(jìn)行簡(jiǎn)算即可.
解答:
解:①1.32-1.32÷(660×0.01)
=1.32-1.32÷6.6
=1.32-0.2
=1.12
②6.3×[(6.1-4.6)÷0.75]
=6.3×[1.5÷0.75]
=6.3×2
=12.6
③[2.8-(0.65+0.55)]÷40
=[2.8-1.2]÷40
=1.6÷40
=0.04
④(16.5×3+7.5×3)÷6
=[(16.5+7.5)×3]÷6
=72÷6
=12
⑤17.68÷5.2+2.7×1.5
=3.4+4.05
=7.45
⑥1.6×55.4-5.54×6
=1.6×55.4-55.4×0.6
=(1.6-0.6)×55.4
=55.4
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.