2.3x6.1十2.3x1.7+7.7x7.8简便方法
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(0.86x12.5)÷(4.3÷0.25)=0.86x12.5÷4.3×0.25=0.86÷4.3×12.5×0.25=0.2×12.5×0.25=0.2×0.25 ×12.5=0.625
咨询记录 · 回答于2022-10-25
2.3x6.1十2.3x1.7+7.7x7.8简便方法
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2.3x6.1十2.3x1.7+7.7x7.8=2.3x6.1十2.3x1.7+ (10-2.3)×7.8=2.3×6.1+2.3×1.7+10×7.8-2.3×7.8=2.3×(6.1+1.7-7.8)+10×7.8=0+78=78
(0.86x12.5)÷(4.3÷0.25)
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(0.86x12.5)÷(4.3÷0.25)=0.86x12.5÷4.3×0.25=0.86÷4.3×12.5×0.25=0.2×12.5×0.25=0.2×0.25 ×12.5=0.625