计算下面各题(能简算的要简算).①4×0.8×2.5×12.5 ② 2 15 ÷[1-( 1 5 +
计算下面各题(能简算的要简算).①4×0.8×2.5×12.5②215÷[1-(15+13)]③(2.8+3.85÷3.5)×4.6④6.5×1.83+0.17×6.5⑤...
计算下面各题(能简算的要简算).①4×0.8×2.5×12.5 ② 2 15 ÷[1-( 1 5 + 1 3 )] ③(2.8+3.85÷3.5)×4.6 ④6.5×1.83+0.17×6.5 ⑤( 5 8 + 2 27 )×8+ 11 27 ⑥ 9 20 ÷[ 3 2 ×(0.4+ 4 5 )].
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①4×0.8×2.5×12.5, =(4×2.5)×(0.8×12.5), =10×10, =100; ②
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③(2.8+3.85÷3.5)×4.6, =(2.8+1.1)×4.6, =3.9×4.6, =17.94; ④6.5×1.83+0.17×6.5, =6.5×(1.83+0.17), =6.5×2, =13; ⑤(
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=5+
=2+(
=2+1, =3; ⑥
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