(1)8×1.09×1.25, =8×1.25×1.09, =10×1.09, =10.9; (2)1.5×106, =1.5×(100+6), =1.5×100+1.5×6, =150+9, =159; (3)1.65×4.3+8.35×4.3, =(1.65+8.35)×4.3, =10×4.3, =43; (4)3.8+7.19+5.2+3.91, =(3.8+5.2)+(7.19+3.91), =9+11.1, =20.1; (5)118-7.5×(0.14+1.6), =118-7.5×1.74, =118-13.05, =104.95; (6)1.7÷2.5×0.4, =0.68×0.4, =0.272. |