题目内容
简便计算.
①7.7×7+7.7×2+7.7
②87.3×45+10.7×45+2×45
③(2.5+2.5+2.5+2.5)×2.5×8.
①7.7×7+7.7×2+7.7
②87.3×45+10.7×45+2×45
③(2.5+2.5+2.5+2.5)×2.5×8.
①7.7×7+7.7×2+7.7,
=7.7×(7+2+1),
=7.7×10,
=77;
②87.3×45+10.7×45+2×45,
=(87.3+10.7+2)×45,
=100×45,
=4500;
③(2.5+2.5+2.5+2.5)×2.5×8,
=(2.5×4)×2.5×4×2,
=10×10×2,
=200.
=7.7×(7+2+1),
=7.7×10,
=77;
②87.3×45+10.7×45+2×45,
=(87.3+10.7+2)×45,
=100×45,
=4500;
③(2.5+2.5+2.5+2.5)×2.5×8,
=(2.5×4)×2.5×4×2,
=10×10×2,
=200.
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