计算,怎样算简便就怎样算 102×(4.5÷0.09) 19.96×5.4-4.4×19.96 3.8+2.49+7.51+4.2 2.3+3.91÷(2
计算,怎样算简便就怎样算102×(4.5÷0.09)19.96×5.4-4.4×19.963.8+2.49+7.51+4.22.3+3.91÷(22-19.7)(1-0....
计算,怎样算简便就怎样算 102×(4.5÷0.09) 19.96×5.4-4.4×19.96 3.8+2.49+7.51+4.2 2.3+3.91÷(22-19.7) (1-0.2)×[13-(3.12+5.28)] 9.9×1.45.
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①102×(4.5÷0.09), =(100+2)×50, =5000+100, =5100; ②19.96×5.4-4.4×19.96, =19.96×(5.4-4.4), =19.96; ③3.8+2.49+7.51+4.2, =(3.8+4.2)+(2.49+7.51), =8+10, =18; ④2.3+3.91÷(22-19.7), =2.3+3.91÷2.3, =2.3+1.7, =4; ⑤(1-0.2)×[13-(3.12+5.28)] =0.8×[13-8.4], =0.8×4.6, =3.68; ⑥9.9×1.45, =(10-0.1)×1.45, =14.5-0.145, =14.355. |
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