用遞等式計(jì)算
(1)6.5×(10-3.7)+2.98(2)[4.75+8.4÷(9.2-6.8)]×40
(3)19.8-0.6×0.6-0.64(4)12.773-[4.5×(0.75-0.356)+9.23]
(5)2.48×(7.3-5.8)+1.5×7.52(6)0.125×7.9×16
(7)(6.4+0.88)÷0.8+3.2×1.25(8)24-[5.4+(0.6+1.38÷0.23)].

解:(1)6.5×(10-3.7)+2.98,
=6.5×6.3+2.98,
=40.95+2.98,
=43.93;

(2)[4.75+8.4÷(9.2-6.8)]×40,
=[4.75+8.4÷2.4]×40,
=8.25×40,
=330;

(3)19.8-0.6×0.6-0.64,
=19.8-(0.36+0.64),
=19.8-1,
=18.8;

(4)12.773-[4.5×(0.75-0.356)+9.23],
=12.773-[4.5×0.394+9.23],
=12.773-1.773-9.23,
=11-9.23,
=1.77;

(5)2.48×(7.3-5.8)+1.5×7.52,
=2.48×1.5+1.5×7.52,
=1.5×(2.48+7.52),
=1.5×10,
=15;

(6)0.125×7.9×16,
=0.125×7.9×(2×8),
=0.125×8×7.9×2,
=1×7.9×2,
=15.8;

(7)(6.4+0.88)÷0.8+3.2×1.25,
=7.28÷0.8+3.2×1.25,
=9.1+4,
=13.1;

(8)24-[5.4+(0.6+1.38÷0.23)],
=24-[5.4+(0.6+6)],
=24-[5.4+0.6+6],
=24-12,
=12.
分析:(1)根據(jù)運(yùn)算順序計(jì)算,先算小括號(hào)里,再算括號(hào)外的乘法,最后算加法;
(2)根據(jù)運(yùn)算順序計(jì)算,先算小括號(hào)里,再算中括號(hào)里的,最后算括號(hào)外的;
(3)先計(jì)算出0.6×0.6,再運(yùn)用減法的性質(zhì)簡(jiǎn)便計(jì)算;
(4)先計(jì)算小括號(hào)里的,再計(jì)算中括號(hào)里的乘法,再運(yùn)用減法的性質(zhì)簡(jiǎn)便計(jì)算;
(5)先算小括號(hào)里的,再運(yùn)用乘法分配律簡(jiǎn)便計(jì)算;
(6)將16寫成2×8,再將0.125與8結(jié)合進(jìn)行簡(jiǎn)便運(yùn)算;
(7)按照運(yùn)算順序計(jì)算即可;
(8)先計(jì)算小括號(hào)里的除法,再運(yùn)用減法的性質(zhì)簡(jiǎn)便計(jì)算中括號(hào)里的數(shù),最后計(jì)算括號(hào)外的.
點(diǎn)評(píng):解決本題要認(rèn)真分析數(shù)據(jù),再選擇適合的方法計(jì)算即可.
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