(1)0.25×[(2.8+4.4)÷1.2], =0.25×[7.2÷1.2], =0.25×6, =1.5; (2)3.7×9.16+6.3×9.16, =(3.7+6.3)×9.16, =10×9.16, =91.6; (3)[32-(1.95-1.95)]÷1.6, =[32-0]÷1.6, =32÷1.6, =20; (4)5.7×10.1, =5.7×(10+0.1), =5.7×10+5.7×0.1, =57+0.57, =57.57. |
(1)0.25×[(2.8+4.4)÷1.2], =0.25×[7.2÷1.2], =0.25×6, =1.5; (2)3.7×9.16+6.3×9.16, =(3.7+6.3)×9.16, =10×9.16, =91.6; (3)[32-(1.95-1.95)]÷1.6, =[32-0]÷1.6, =32÷1.6, =20; (4)5.7×10.1, =5.7×(10+0.1), =5.7×10+5.7×0.1, =57+0.57, =57.57. |