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计算下面各题,能简算的要用简便方法计算.(1)50...

(1)50.34+11.645-42.34,=50.34-42.34+11.645,=8+11.645,=19.645;(2)99+99×99,=99×(1+99),=99×100,=9900;(3)8.64-(2.75+3.64)=8.64-2.75-3.64=8.64-3.64-2.75=5-2.75=2.25(4)15.07-7.34+20.93=15.07+20.93-7.34=36-7.34=28.6...

①9.6+1.8-1.5=11.4-1.5=9.9;②0.21+3.48+0.79=3.48+(0.21+0.79)=3.48+1=4.48;③15.3-(0.91+2.3)=15.3-2.3-0.91=13-0.91=12.09.

(1)23.4-5.7-4.3,=23.4-(5.7+4.3),=23.4-10,=13.4;(2)(467+36×3)÷23,=(467+108)÷23,=575÷23,=25;(3)25×50×4×6,=(25×4)×(50×6),=100×300,=30000;(4)46×16+16×54,=(46+54)×16,=100×16,=1600;(5)14.9+3.7+5....

(1)23.4-5.7-4.3, =23.4-(5.7+4.3), =23.4-10, =13.4; (2)(467+36×3)÷23, =(467+108)÷23, =575÷23, =25; (3)25×50×4×6, =(25×4)×(50×6), =100×300, =30000; (4)46×16+16×54, =(46+54)×16, =100×16, =1600; ...

(1)9+0.56+6.1+0.44=(9+6.1)+(0.56+0.44)=15.1+1=16.1;(2)50÷2.5+1.8×4.5=20+8.1=28.1;(3)87×[40÷(3.49-3.09)]=87×[40÷0.4]=87×100=8700;(4)0.8×(12.5+0.125)=0.8×12.5+0.8×0.125=10+0.1=10.1.

(594-50X9)÷25 =(594-450)÷25 =144÷25 =5……19

①627+9105÷15,=627+607,=1234;②5.78×99+5.78=5.78×(99+1),=5.78×100,=578;(3)413×(38+0.25×23),=413×(38+16),=413×1324,=16;④78.5÷0.25÷4,=7.85÷(0.25×4),=7.85÷1,=7.85;⑤5056-45.75-4.25=5056-(45.75+4.25),=5056-5...

(1)125×24,=125×8×3,=1000×3,=3000;(2)210×21=4410;(3)50×240=12000;(4)199×40,=(200-1)×40,=200×40-1×40,=8000-40,=7960.

(1)75-15.38+61.25-4.62=(75+61.25)-(15.38+4.62)=136.25-20=116.25;(2)765×64×0.5×2.5×0.125=765×(2×4×8)×0.5×2.5×0.125=765×(2×0.5)×(4×2.5)×(8×0.125)=765×1×10×1=7650;(3)50×96+57×4+7×66=50×96+(50+7)×4+7×66=50×96+...

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