(1)96.3-1.4×45÷2.1
(2)3.75×1.6-7÷8
(3)9.6×12.5×0.25×5
(4)36.2×6.4+36.2×2.6+36.2
(5)(9.78+1.02)×(5.1-2.7)
(6)[4-(2.5-0.25)]÷2.5×0.4.
分析:(1)先算乘除,后算減;
(2)先算乘除,后算減;
(3)把9.6分成8乘0.2,然后利用乘法的結(jié)合律進行計算;
(4)同時提取36.2,利用乘法分配律的逆運算;
(5)先計算括號里的加和減,最后計算括號外面的乘;
(6)先計算小括號里的再計算中括號里的,最后計算括號外面的.
解答:解:(1)96.3-1.4×45÷2.1,
=96.3-30,
=66.3;

(2)3.75×1.6-7÷8,
=6-0.875,
=5.125;

(3)9.6×12.5×0.25×5,
=1.2×8×12.5×0.25×5,
=(1.2×5)×(8×12.5)×0.25,
=6×100×0.25,
=150;

(4)36.2×6.4+36.2×2.6+36.2,
=36.2×(6.4+2.6+1),
=36.2×10,
=362;

(5)(9.78+1.02)×(5.1-2.7),
=10.8×2.4,
=25.92;

(6)[4-(2.5-0.25)]÷2.5×0.4,
=[4-2.25]÷2.5×0.4,
=1.75÷2.5×0.4,
=0.28;
點評:如果是同一級運算,一般按從左往右依次進行計算;如果既有加減、又有乘除法,先算乘除法、再算加減;有括號的,要先算括號里面的.
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