计算下面各题,能简算的要简算.①7.6×0.8+0.42 ②3.2×1.25×0.25 ③7.8×1.01 ④1.36+0.7×5.4
计算下面各题,能简算的要简算.①7.6×0.8+0.42②3.2×1.25×0.25③7.8×1.01④1.36+0.7×5.4⑤89-(14-19)-34⑥1921+5...
计算下面各题,能简算的要简算.①7.6×0.8+0.42 ②3.2×1.25×0.25 ③7.8×1.01 ④1.36+0.7×5.4 ⑤ 8 9 -( 1 4 - 1 9 )- 3 4 ⑥ 19 21 + 5 7 - 3 14 .
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①7.6×0.8+0.42, =6.08+0.42, =6.5; ②3.2×1.25×0.25, =4×0.8×1.25×0.25, =(4×0.25)×(0.8×1.25), =1×1, =1; ③7.8×1.01, =7.8×(1+0.01), =7.8+0.078, =7.878; ④1.36+0.7×5.4, =1.36+3.78, =5.14; ⑤
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