考點(diǎn):整數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)先算除法,再算減法,最后算乘法;
(2)先算乘法,再算加法,最后算減法;
(3)先算乘法和除法,再算減法;
(4)先算除法和乘法,再算加法;
(5)先算括號(hào)里面的除法,再算減法,最后算括號(hào)外面的除法;
(6)先算括號(hào)里面的減法,再算除法,最后算括號(hào)外面的除法.
解答:
解:(1)735×(70-400÷25)
=735×(70-16)
=735×54
=39690;
(2)1520-(1070+28×2)
=1520-(1070+56)
=1520-1126
=394;
(3)56×3-224÷8
=168-28
=140;
(4)240÷2+120×8
=120+960
=1080;
(5)(711-711÷9)÷2
=(711-79)÷2
=632÷2
=316;
(6)900-720÷(153-147)
=900-720÷6
=900-120
=780.
點(diǎn)評(píng):整數(shù)混合運(yùn)算的關(guān)鍵抓住運(yùn)算順序,正確按運(yùn)算順序計(jì)算即可.