脱式计算,能简算的要简算. (1)8×1.09×1.25 (2)1.5×106 (3)1.65×4.3+8.35×4.3 (4)3.8+7.1
脱式计算,能简算的要简算.(1)8×1.09×1.25(2)1.5×106(3)1.65×4.3+8.35×4.3(4)3.8+7.19+5.2+3.91(5)118-7...
脱式计算,能简算的要简算. (1)8×1.09×1.25 (2)1.5×106 (3)1.65×4.3+8.35×4.3 (4)3.8+7.19+5.2+3.91 (5)118-7.5×(0.14+1.6) (6)1.7÷2.5×0.4.
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(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. |
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