考點:整數(shù)四則混合運算,運算定律與簡便運算
專題:運算順序及法則
分析:(1)乘法利用結(jié)合律簡算,再算加法;
(2)利用除法的性質(zhì)簡算;
(3)利用乘法分配律簡算;
(4)利用減法的性質(zhì)和結(jié)合律簡算;
(5)先算減法,再算除法,最后算乘法;
(6)先算括號里面的減法,再算括號里面的除法,括號外面的除法,最后算括號外面的減法.
解答:
解:(1)152+48×125
=152+6×(8×125)
=152+6×1000
=152+6000
=6152;
(2)13500÷54
=13500÷9÷6
=1500÷6
=250;
(3)76×34-76+67×76
=76×(34-1+67)
=76×1000
=76000;
(4)78.48-(12.9-11.52)-27.1
=78.48+11.52-(12.9+27.1)
=90-40
=50;
(5)(7032-2232)÷16×15
=4800÷16×15
=300×15
=4500;
(6)48-48÷[150÷(50-25)]
=48-48÷[150÷25]
=48-48÷6
=48-8
=40.
點評:混合運算的關(guān)鍵是抓住運算順序,正確按運算順序計算,適當(dāng)利用運算定律簡算即可.