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脱式计算.(能简算的要简算)(1)1.08×0.8÷0.27...

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)102×0.45=(100+2)×0.45,=100×0.45+2×0.45,=45+0.9,=45.9;(3)22.78÷1.25÷0.8=22.78÷(1.25×0.8),=22.78÷1,=22.78;(4)0.34×101-0.34=(101-1)×0.34,=100×0.34,=34.

(4)4.08×0.8÷0.p7=4.08÷0.p7×0.8,=4×0.8,=a.p;(p)40p×0.4我=(400+p)×0.4我,=400×0.4我+p×0.4我,=4我+0.4,=4我.4;(a)pp.78÷4.p我÷0.8=pp.78÷(4.p我×0.8),=pp.78÷4,=pp.78;(4)0.a4×404-0.a4=(404-4)×0.a4,=400×0.a4,=a4.

原式 =(1.08÷0.27)x0.8 =4x0.8 =3.2

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)2.6×1.7+1.4×1.7=(2.6+1.4)×1.7,=4×1.7,=6.8;(3)0.4×63×2.5=0.4×2.5×63,=1×63,=63.

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)2.6×1.7+1.4×1.7=(2.6+1.4)×1.7,=4×1.7,=6.8;(3)0.4×63×2.5=0.4×2.5×63,=1×63,=63.

见图

(1)1020+270÷18-864,=1020+15-864,=171;(2)23÷0.8×34,=23÷45×34,=23×54×34,=58;(3)18+57+6.875+27,=(18+6.875)+(57+27),=(0.125+6.875)+1,=7+1,=8;(4)0.25×64×125%,=0.25×4×2×8×1.25,=(0.25×4)×(8×1.25)×2,=1×...

(1)0.125× 1 4 +1.875÷4,=0.125× 1 4 +1.875× 1 4 ,=(0.125+1.875)× 1 4 ,=2× 1 4 ,= 1 2 ;(2)27×99,=27×(100-1),=2700-27,=2673;(3)30.1-16.8÷3.5×6.2,=30.1-4.8×6.2,=30.1-29.76,=0.34;(4) 5 4 ×2.5× 4 5 ×0.4,=(...

1.08x0.8÷0.27 =0.864÷0.27 =3.2

①27÷49+57÷49,=27×94+57×94,=(27+57)×94,=94;②120.8×2.75-0.8×2.75,=2.75×(120.8-0.8),=2.75×120,=330;③32×310+1÷125%,=9.6+0.8,=10.4;④63×(27?172)-0.125,=63×27-63×172-18,=18-(78+18),=18-1,=17.

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